2-Ethylbutanoyl-Ile-NHCH(2-oxononyl)-CO-Asp-Leu-OH AIDS-164982 AIDS164982 L-Leucine, N-[2-[[(2S,3S)-2-[(2-ethyl-1-oxobutyl)amino]-3-methyl-1-oxopentyl]amino]-1,4-dioxoundecyl]-L-.alpha.-aspartyl-