D-Serine, N-[[2-(2,1,3-benzoxadiazol-5-ylmethoxy)-4-[(2-bromo[1,1'-biphenyl]-3-yl)methoxy]-5-chlorophenyl]methyl]-, ethyl ester, hydrochloride (1:1)

PD-1/PD-L1-IN-23 is a potent and orally active inhibitor of PD-1/PD-L1. PD-1/PD-L1-IN-23 is an ester prodrug of L7. L7 is a benzo[c][1,2,5]oxadiazole derivative and biologically evaluated as inhibitors of PD-L1. PD-1/PD-L1-IN-23 displays significant antitumor effects in tumor models of syngeneic and PD-L1 humanized mice[1].

[1]. Liu L, et al. Syntheses, Biological Evaluations, and Mechanistic Studies of Benzo[c][1,2,5]oxadiazole Derivatives as Potent PD-L1 Inhibitors with In Vivo Antitumor Activity. J Med Chem. 2021;64(12):8391-8409.