AIDS-005438 AIDS005438 Ala-NH-Azepin, Val-Val deriv. N-[2(S)-[2-Oxo-3(R,S)-benzyl-5-[1(S)-(alaninylamino)ethyl]-2,3,6,7-tetrahydro-1H-azepin-1-yl]-1-oxopropyl]valinylvaline, methyl ester