AIDS-164978 AIDS164978 L-Leucine, N-[4-cyclopentyl-2-[[(2S,3S)-3-methyl-2-[[(2S)-3-methyl-2-[methyl(1-oxo-3-phenylpropyl)amino]-1-oxobutyl]amino]-1-oxopentyl]amino]-1,4-dioxobutyl]-L-.alpha.-aspartyl- PhCH2CH2CO-N-Me-Val-Ile-NHCH(2-cyclopentyl-2-oxoethyl)-CO-Asp-Leu-OH