(2R)-N-{(1S,3S,4S)-3-Hydroxy-5-phenyl-1-benzyl-4-[(1,3-thiazol-5-ylmethoxy)carbonylamino]pentyl}-3-methyl-2-[(methyl{[2-(methylethyl)(1,3-thiazol-5-yl)]methyl}amino)carbonylamino]butanamide A-117673 AIDS-043518 AIDS043518 Ritonavir diastereoisomer