Glucocorticoid receptor agonist-1 phosphate Ala-Ala-Mal is a glucocorticoid receptor agonist. Glucocorticoid receptor agonist-1 phosphate Ala-Ala-Mal can be used in anti-CD40 antibody agent conjugate (ADC). Glucocorticoid receptor agonist-1 phosphate Ala-Ala-Mal can be used for the research of inflammation and immune regulation.