AIDS-218081 AIDS218081 [Gly-Ser(Bn)-Tyr(Bn)-Asn-Leu-OMe], N-[[[[(2S,8S)-8-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]-1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-2-yl]methyl]thio]acetyl]-