3-[1-(9H-Fluoren-9-ylmethoxycarbonylamino)-2-hydroxy-ethylcarbamoyl]-3,4-dihydro-1H-isoquinoline-2-carboxylic acid 9H-fluoren-9-ylmethyl ester AIDS-071996 AIDS071996 Fmoc-Tic-gSer-Fmoc