((S)-1-{1-[(S)-2-(9H-Fluoren-9-ylmethoxycarbonylamino)-3-phenyl-propanoylamino]-2-hydroxy-ethylcarbamoyl}-2-phenyl-ethyl)-carbamic acid 9H-fluoren-9-ylmethyl ester AIDS-051338 AIDS051338 Fmoc-Phe-gSer-Phe-Fmoc