4-Pyridyl-CH2OCO-Val-Phe deriv. AIDS-070513 AIDS070513 {(S)-2-Methyl-1-[(S)-1-((2R,3S)-3-{[(S)-3-methyl-2-(pyridin-4-ylmethoxycarbonylamino)-butanoylamino]-methyl}-oxiranyl)-2-phenyl-ethylcarbamoyl]-propyl}-carbamic acid pyridin-4-ylmethyl ester