(3S,5S,6S,9S)-5-Hydroxy-12-methyl-9-(1-methylethyl)-13-[2-(1-methylethyl)-4-thiazolyl]-8,11-dioxo-3,6-bis(phenylmethyl)-2,7,10,12-tetraazatridecanoic Acid 5-Thiazolylmethyl Ester; Ritonavir Impurity I;|(5S,8S,9S,11S)-9-Hydroxy-2-methyl-5-(1-methylethyl)-1-[2-(1-methylethyl)-4-thiazolyl]-3,6-dioxo-8,11-bis(phenylmethyl)-2,4,7,12-tetraazatridecan-13-oic Acid 5-Thiazolylmethyl Ester;

4-Dehydroxy-5-Hydroxy Ritonavir is an impurity of the selective HIV protease inhibitor Ritonavir.