Basic Description

Synonyms	diphenhydramine \| 58-73-1 \| Benadryl \| Benzhydramine \| 2-(Benzhydryloxy)-N,N-dimethylethanamine \| Alledryl \| Probedryl \| Dihidral \| Antistominum \| Benzhydraminum \| Benzhydroamina \| Diphantine \| Difenhydramin \| Allergical \| Baramine \| Benachlor \| Benadrin \| Benodine \| Benzantine \| Benzhydril \| B
Specifications & Purity	Moligand™, ≥98%(GC)
Shipped In	Normal
Grade	Moligand™
Action Type	ANTAGONIST
Mechanism of action	Antagonist of H 1 receptor

Associated Targets(Human)

HRH1 Tclin Histamine H1 receptor (3 Activities)

Discover Target: HRH1

Activity Type	Activity Value -log(M)	Mechanism of Action	Activity Reference	Publications (PubMed IDs)

CHRM4 Tclin Muscarinic acetylcholine receptor M4 (1 Activities)

Discover Target: CHRM4

Activity Type	Activity Value -log(M)	Mechanism of Action	Activity Reference	Publications (PubMed IDs)

CHRM1 Tclin Muscarinic acetylcholine receptor M1 (1 Activities)

Discover Target: CHRM1

Activity Type	Activity Value -log(M)	Mechanism of Action	Activity Reference	Publications (PubMed IDs)

KCNH2 Tclin Potassium voltage-gated channel subfamily H member 2 (2 Activities)

Discover Target: KCNH2

Activity Type	Activity Value -log(M)	Mechanism of Action	Activity Reference	Publications (PubMed IDs)

PDE5A Tclin Phosphodiesterase 5A (5113 Activities)

Discover Target: PDE5A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

EGFR Tclin Epidermal growth factor receptor erbB1 (33727 Activities)

Discover Target: EGFR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

F2 Tclin Thrombin (11687 Activities)

Discover Target: F2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

CA2 Tclin Carbonic anhydrase II (17698 Activities)

Discover Target: CA2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ESR1 Tclin Estrogen receptor alpha (17718 Activities)

Discover Target: ESR1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HMGCR Tclin HMG-CoA reductase (2475 Activities)

Discover Target: HMGCR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

NR3C1 Tclin Glucocorticoid receptor (14987 Activities)

Discover Target: NR3C1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

INSR Tclin Insulin receptor (5558 Activities)

Discover Target: INSR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

PGR Tclin Progesterone receptor (8562 Activities)

Discover Target: PGR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ADRB2 Tclin Beta-2 adrenergic receptor (11824 Activities)

Discover Target: ADRB2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

CHRM2 Tclin Muscarinic acetylcholine receptor M2 (10671 Activities)

Discover Target: CHRM2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ADRB1 Tclin Beta-1 adrenergic receptor (6630 Activities)

Discover Target: ADRB1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HTR1A Tclin Serotonin 1a (5-HT1a) receptor (14969 Activities)

Discover Target: HTR1A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ADRA2A Tclin Alpha-2a adrenergic receptor (9450 Activities)

Discover Target: ADRA2A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

AR Tclin Androgen Receptor (11781 Activities)

Discover Target: AR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

CHRM1 Tclin Muscarinic acetylcholine receptor M1 (12690 Activities)

Discover Target: CHRM1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

VDR Tclin Vitamin D receptor (26531 Activities)

Discover Target: VDR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ACE Tclin Angiotensin-converting enzyme (1423 Activities)

Discover Target: ACE

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

DRD2 Tclin Dopamine D2 receptor (23596 Activities)

Discover Target: DRD2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

GABRA1 Tclin GABA receptor alpha-1 subunit (399 Activities)

Discover Target: GABRA1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

TSHR Tclin Thyroid stimulating hormone receptor (29986 Activities)

Discover Target: TSHR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

MAOA Tclin Monoamine oxidase A (11911 Activities)

Discover Target: MAOA

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

CNR1 Tclin Cannabinoid CB1 receptor (20913 Activities)

Discover Target: CNR1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

DRD1 Tclin Dopamine D1 receptor (9720 Activities)

Discover Target: DRD1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

DRD4 Tchem Dopamine D4 receptor (7907 Activities)

Discover Target: DRD4

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ACHE Tclin Acetylcholinesterase (18204 Activities)

Discover Target: ACHE

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

PTGS1 Tclin Cyclooxygenase-1 (9233 Activities)

Discover Target: PTGS1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

SLC6A2 Tclin Norepinephrine transporter (10102 Activities)

Discover Target: SLC6A2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HRH2 Tclin Histamine H2 receptor (5428 Activities)

Discover Target: HRH2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ADRA1D Tclin Alpha-1d adrenergic receptor (4171 Activities)

Discover Target: ADRA1D

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HTR1B Tclin Serotonin 1b (5-HT1b) receptor (2801 Activities)

Discover Target: HTR1B

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HTR2A Tclin Serotonin 2a (5-HT2a) receptor (14758 Activities)

Discover Target: HTR2A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HTR2C Tclin Serotonin 2c (5-HT2c) receptor (11471 Activities)

Discover Target: HTR2C

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

AVPR2 Tclin Vasopressin V2 receptor (2912 Activities)

Discover Target: AVPR2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ADORA1 Tclin Adenosine A1 receptor (17603 Activities)

Discover Target: ADORA1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

AGTR1 Tclin Type-1 angiotensin II receptor (5176 Activities)

Discover Target: AGTR1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

CALCR Tclin Calcitonin receptor (2215 Activities)

Discover Target: CALCR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

SLC6A4 Tclin Serotonin transporter (12625 Activities)

Discover Target: SLC6A4

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

CRHR1 Tclin Corticotropin releasing factor receptor 1 (2996 Activities)

Discover Target: CRHR1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ADRA1A Tclin Alpha-1a adrenergic receptor (8359 Activities)

Discover Target: ADRA1A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

PTGS2 Tclin Cyclooxygenase-2 (13999 Activities)

Discover Target: PTGS2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HRH1 Tclin Histamine H1 receptor (7573 Activities)

Discover Target: HRH1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ADRA1B Tclin Alpha-1b adrenergic receptor (2912 Activities)

Discover Target: ADRA1B

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

OPRM1 Tclin Mu opioid receptor (19785 Activities)

Discover Target: OPRM1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

DRD3 Tclin Dopamine D3 receptor (14368 Activities)

Discover Target: DRD3

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

AVPR1A Tclin Vasopressin V1a receptor (5412 Activities)

Discover Target: AVPR1A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

OPRD1 Tclin Delta opioid receptor (15096 Activities)

Discover Target: OPRD1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

OPRK1 Tclin Kappa opioid receptor (16155 Activities)

Discover Target: OPRK1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

HTR3A Tclin Serotonin 3a (5-HT3a) receptor (3366 Activities)

Discover Target: HTR3A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

GCGR Tclin Glucagon receptor (2563 Activities)

Discover Target: GCGR

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Associated Targets(non-human)

Htr7 Serotonin 7 (5-HT7) receptor (19 Activities)

Discover Target: Htr7

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Agtr2 Angiotensin II type 2 (AT-2) receptor (803 Activities)

Discover Target: Agtr2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ampC Beta-lactamase AmpC (62480 Activities)

Discover Target: ampC

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Mc4r Melanocortin receptor 4 (1205 Activities)

Discover Target: Mc4r

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Ltc4s Leukotriene C4 synthase (1 Activities)

Discover Target: Ltc4s

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Sigmar1 Sigma opioid receptor (160 Activities)

Discover Target: Sigmar1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Npy1r Neuropeptide Y receptor type 1 (8 Activities)

Discover Target: Npy1r

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Hrh4 Histamine H4 receptor (388 Activities)

Discover Target: Hrh4

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Cckar Cholecystokinin A receptor (90 Activities)

Discover Target: Cckar

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Ntsr1 Neurotensin receptor 1 (48 Activities)

Discover Target: Ntsr1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Pde4d Phosphodiesterase 4D (4 Activities)

Discover Target: Pde4d

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Bdkrb1 Bradykinin B1 receptor (77 Activities)

Discover Target: Bdkrb1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Nos2 Nitric oxide synthase, inducible (3573 Activities)

Discover Target: Nos2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Mapk1 MAP kinase ERK2 (650 Activities)

Discover Target: Mapk1

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Hdac6 Histone deacetylase 6 (222 Activities)

Discover Target: Hdac6

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

PDE6A Phosphodiesterase 6A (40 Activities)

Discover Target: PDE6A

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Mmp9 Matrix metalloproteinase 9 (38 Activities)

Discover Target: Mmp9

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Plasmodium falciparum (966862 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Cavia porcellus (23802 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Felis catus (3858 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Mus musculus (284745 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Rattus norvegicus (775804 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Luciferin 4-monooxygenase (66902 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

rep Replicase polyprotein 1ab (378 Activities)

Discover Target: rep

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Brain (1 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Plasma (328 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Slc22a5 Solute carrier family 22 member 5 (44 Activities)

Discover Target: Slc22a5

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

ffp 4'-phosphopantetheinyl transferase ffp (24982 Activities)

Discover Target: ffp

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Scn2a Sodium channel alpha subunits; brain (Types I, II, III) (344 Activities)

Discover Target: Scn2a

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

CACNA1C Voltage-dependent L-type calcium channel subunit alpha-1C (242 Activities)

Discover Target: CACNA1C

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Glra2 Glycine receptor (1745 Activities)

Discover Target: Glra2

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

SARS-CoV-2 (38078 Activities)

Activity Type	Relation	Activity value	Units	Action Type	Journal	PubMed Id	doi	Assay Aladdin ID

Names and Identifiers

Pubchem Sid	488179741
Pubchem Sid Url	https://pubchem.ncbi.nlm.nih.gov/substance/488179741
IUPAC Name	2-benzhydryloxy-N,N-dimethylethanamine
INCHI	InChI=1S/C17H21NO/c1-18(2)13-14-19-17(15-9-5-3-6-10-15)16-11-7-4-8-12-16/h3-12,17H,13-14H2,1-2H3
InChi Key	ZZVUWRFHKOJYTH-UHFFFAOYSA-N
Canonical SMILES	CN(C)CCOC(C1=CC=CC=C1)C2=CC=CC=C2
Isomeric SMILES	CN(C)CCOC(C1=CC=CC=C1)C2=CC=CC=C2
PubChem CID	3100
Molecular Weight	255.36

Database links

PubChem CID	3100
DrugBank Ligand	DB01075
CAS Registry No.	58-73-1
ChEBI	CHEBI:4636
Wikipedia	Diphenhydramine
BindingDB Ligand	50017674
ChEMBL Ligand	CHEMBL657
BitterDB Ligand	61
RCSB PDB Ligand	2PM
PEP	diphenhydramine
DrugCentral Ligand	916
GPCRdb Ligand	diphenhydramine
PubChem SID	488179741

Certificates

Certificate of Analysis(COA)

Enter Lot Number to search for COA:

To view the certificate results,please click on a Lot number.For Lot numbers from past orders,please use our order status section

11 results found

Lot Number	Certificate Type	Date	Item
C2302786	Certificate of Analysis	Dec 28, 2022	D155990
C2302787	Certificate of Analysis	Dec 28, 2022	D155990
C2302788	Certificate of Analysis	Dec 28, 2022	D155990
C2302789	Certificate of Analysis	Dec 28, 2022	D155990
C2302790	Certificate of Analysis	Dec 28, 2022	D155990
C2302791	Certificate of Analysis	Dec 28, 2022	D155990
F2229056	Certificate of Analysis	Jun 13, 2022	D155990
F2229057	Certificate of Analysis	Jun 13, 2022	D155990
F2229058	Certificate of Analysis	Jun 13, 2022	D155990
K2214077	Certificate of Analysis	Jun 13, 2022	D155990
K2214078	Certificate of Analysis	Jun 13, 2022	D155990

Chemical and Physical Properties

Sensitivity	Light Sensitive,Air Sensitive
Refractive Index	1.55
Flash Point(°C)	102 °C

Safety and Hazards(GHS)

Pictogram(s)	GHS07
Signal	Warning
Hazard Statements	H315:Causes skin irritation H319:Causes serious eye irritation H302:Harmful if swallowed
Precautionary Statements	P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do - continue rinsing. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of water. P321:Specific treatment (see ... on this label). P501:Dispose of contents/container to ... P264:Wash hands [and …] thoroughly after handling. P270:Do not eat, drink or smoke when using this product. P362+P364:Take off contaminated clothing and wash it before reuse. P330:Rinse mouth. P264+P265:Wash hands [and …] thoroughly after handling. Do not touch eyes. P301+P317:IF SWALLOWED: Get medical help. P337+P317:If eye irritation persists: Get medical help. P332+P317:If skin irritation occurs: Get medical help.
Merck Index	3309

Citations of This Product

1. Fei Gong, Huihui Hu, Ying Ouyang, Zheng-Zheng Liao, Ying Kong, Jin-Fang Hu, Hua He, Ying Zhou. (2023) Physiologically-based pharmacokinetic modeling-guided rational combination of tacrolimus and voriconazole in patients with different CYP3A5 and CYP2C19 alleles. TOXICOLOGY AND APPLIED PHARMACOLOGY, 466 (116475). [PMID:36931438]
2. Yangjie LI, Jiaying HUANG, Jihui FANG, Zhiye HUANG. (2022) [Fast screening and confirmation of 73 common prohibited compounds in cosmetics by ultra performance liquid chromatography-quadrupole-time-of-flight high resolution mass spectrometry].. Chinese Journal of Chromatography, 40 (5): (433-442). [PMID:35478002]
3. Fan Li, Zhicong Lu, Peng Zhang, Yang Jin, Tong Li, Chun Hu. (2022) Boosting the Extra Generation of Superoxide Radicals on Graphitic Carbon Nitride with Carbon Vacancies by the Modification of Pollutant Adsorption for High-Performance Photocatalytic Degradation. ACS ES&T Engineering, 2 (7): (1296–1305). [PMID:]

References

1. Fei Gong, Huihui Hu, Ying Ouyang, Zheng-Zheng Liao, Ying Kong, Jin-Fang Hu, Hua He, Ying Zhou. (2023) Physiologically-based pharmacokinetic modeling-guided rational combination of tacrolimus and voriconazole in patients with different CYP3A5 and CYP2C19 alleles. TOXICOLOGY AND APPLIED PHARMACOLOGY, 466 (116475). [PMID:36931438]
2. Yangjie LI, Jiaying HUANG, Jihui FANG, Zhiye HUANG. (2022) [Fast screening and confirmation of 73 common prohibited compounds in cosmetics by ultra performance liquid chromatography-quadrupole-time-of-flight high resolution mass spectrometry].. Chinese Journal of Chromatography, 40 (5): (433-442). [PMID:35478002]
3. Fan Li, Zhicong Lu, Peng Zhang, Yang Jin, Tong Li, Chun Hu. (2022) Boosting the Extra Generation of Superoxide Radicals on Graphitic Carbon Nitride with Carbon Vacancies by the Modification of Pollutant Adsorption for High-Performance Photocatalytic Degradation. ACS ES&T Engineering, 2 (7): (1296–1305). [PMID:]

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SKU	Size	Availability	Price
D155990-1g	1g	In stock	$10.90
D155990-5g	5g	In stock	$39.90
D155990-25g	25g	In stock	$113.90

Diphenhydramine - ≥98.0%(GC), high purity , CAS No.58-73-1, Antagonist of H 1 receptor