(R)-2-({1-[(2S,4R)-1-((S)-2-{(S)-2-[(R)-2-((S)-2-Acetylamino-3-carboxy-propanoylamino)-4-carboxy-butanoylamino]-2-cyclohexyl-ethanoylamino}-3-methyl-butanoyl)-4-(naphthalen-2-ylmethoxy)-pyrrolidin-2-yl]-methanoyl}-amino)-pentanoic acid AIDS-155508 AIDS155508