(R)-2-[(S)-2-((S)-2-{(S)-2-[(S)-2-((R)-2-Acetylamino-2-carboxy-ethanoylamino)-4-carboxy-butanoylamino]-3,3-diphenyl-propanoylamino}-4-carboxy-butanoylamino)-3-cyclohexyl-propanoylamino]-3-mercapto-propionic acid AIDS-107413 AIDS107413