AIDS-006440 AIDS006440 RPI-856 A, H-1, H-2 deriv. Valyl-[2(R or S)-amino-2-(3,5-dihydroxyphenyl)acetic acid]-leucyl-[3(S)-amino-2(RS)-hydroxy-4-phenylbutyric acid]-valyl-valyl-aspartic acid, dihydro deriv. of RPI-856A