AIDS-028527 AIDS028527 MP-134 N-(2(R),3(S)-Dihydroxy-4(S)-(3-methyl-2-(2(S)-pyridylcarbonylamino)butanoylamino)-5-phenyl-1(S)-benzylpentyl)-3-methyl-2(S)-(2-pyridylcarbonylamino)butanamide