Lopinavir EP Impurity S

Chemical Name: (1S,3S)-1-[(1S)-1-[[2-(2,6-Dimethylphenoxy)acetyl]amino]-2-phenylethyl]-3-[[(2S)-3-methyl-2-[2-oxotetrahydropyrimidin-1(2H)-yl]butanoyl]amino]-4phenylbutyl2-(2,6-dimethylphenoxy)acetate (as per EP); (2S,3S,5S)-2-[2-(2,6-Dimethylphenoxy)acetamido]-5-{(S)-3-methyl-2-[2-oxotetrahydropyrimidin-1(2H)-yl]butanamido}-1,6-diphenylhexan-3-yl 2-(2,6-dimethylphenoxy)acetate (as per USP)