Ritonavir EP Impurity S

Chemical Name: Thiazol-5-yl-methyl [(1S,2S,4S)-1-benzyl-4-[[(2S)-2[[[(1S,3S,4S)-1-benzyl-3-hydroxy-5-phenyl-4-[[(thiazol-5-ylmethoxy)carbonyl]amino]pentyl]carbamoyl] amino]-3-methylbutanoyl]amino]-2-hydroxy-5-phenylpentyl]carbamate (as per EP);(3S,4S,6S,10S,13S,15S,16S)-Bis(thiazol-5-ylmethyl)-4,15-dihydroxy-10-isopropyl-8,11-dioxo-3,6,13,16-tetrabenzyl-2,7,9,12,17-pentaazaoctadecanedioate (as per USP)

Synonym:  Ritonavir Diacyl valine urea Analog (USP)