Thiazol-5-ylmethyl ((S,3R,S)-3-Hydroxy-5-(S)-2-(3-((2-Sopropylthiazol-4-yl)methyl)-3-methylureido)-3-methylbutanamido)-1,6-diphenylhexan-2-yl)carbamate; (S,4R,S,S)-4-Hydroxy-12-methyl-9-(1-methylethyl)-13-[2-(1-methylethyl)-4-thiazolyl]-8,11-dioxo-3,6-bS(phenylmethyl)-2,7,10,12-Tetraazatridecanoic acid 5-thiazolylmethyl Ster; Ritonavir Impurity O (EP)