L-778123 hydrochloride is an inhibitor of FPTase and GGPTase-I with IC50 of 2 nM and 98 nM in enzyme inhibition determination.IC50 value: 2 nM Target: FPTasein vitro: L-778123 can completely inhibit Ki-Ras prenylation.L-778123 as a farnesyltransferase inhibitor can have a good cytotoxic activity as a classic anti-cancer agent.in vivo: In the dog model, L-778123 inhibits HDJ2 prenylation and produces measurable, albeit slight (5%), levels of unprenylatedRap1A in PBMCs.