2-Ethylbutanoyl-Tbg-NHCH(2-oxononyl)-CO-NHCH[C(CH3)2COOH]-CO-Leu-OH AIDS-164985 AIDS164985 L-Leucine, N-[2-[[(2S)-2-[(2-ethyl-1-oxobutyl)amino]-3,3-dimethyl-1-oxobutyl]amino]-1,4-dioxoundecyl]-3,3-dimethyl-.alpha.aspartyl-