AIDS-006055 AIDS006055 Ac-Ala-Arg-Val-Leu.psi.[]Ala-Glu-Ala-NH2 N-Acetyl-L-alanyl-L-arginyl-L-valyl-(2S,3S)-2,5-dimethyl-3-aminohexanoyl-L,.alpha.-glutamyl-L-alaninamide