European Pharmacopoeia (EP) Reference Standard Synonym(s): Ritonavir; 1,3-Thiazol-5-ylmethyl N -[(2 S ,3 S ,5 S )-3-hydroxy-5-[[(2 S )-3-methyl-2-[[methyl-[(2-propan-2-yl-1,3-thiazol-4-yl)methyl]carbamoyl]amino]butanoyl]amino]-1,6-diphenylhexan-2-yl]carbamate Empirical Formula:...