lopinavir (2S)-N-[(2S,4S,5S)-5-{[(2,6-dimethylphenoxy)acetyl]amino}-4-hydroxy-1,6-diphenylhexan-2-yl]-3-methyl-2-(2-oxotetrahydropyrimidin-1(2H)-yl)butanamide A dicarboxylic acid amide in which a parent structure of amphetamine is substituted on nitrogen by a (2,6-dimethylphenoxy)acetyl group and on the carbon alpha to nitrogen by a (1S,3S)-1-hydroxy-3-{[(2S)-3-methyl-2-(2-oxotetrahydropyrimidin-1(2H)-yl)butanoyl]amino}-4-phenylbutyl group. An antiretroviral of the protease inhibitor class. It is used against HIV infections as a fixed-dose combination with another protease inhibitor, ritonavir. C37H48N4O5 CAS:192725-17-0 CC(C)[C@H](N1CCCNC1=O)C(=O)N[C@H](C[C@H](O)[C@H](Cc1ccccc1)NC(=O)COc1c(C)cccc1C)Cc1ccccc1 DrugBank:DB01601 LINCS:LSM-6027 MeSH:D061466 organic molecular entity