2-Ethylbutanoyl-Tbg-NHCH(2-oxoheptyl)-CO-Asp-Leu-OH AIDS-164983 AIDS164983 L-Leucine, N-[2-[[(2S)-2-[(2-ethyl-1-oxobutyl)amino]-3,3-dimethyl-1-oxobutyl]amino]-1,4-dioxononyl]-L-.alpha.aspartyl-