123951-94-0 AIDS-001229 AIDS001229 Butanoic acid, L-2-aminobutanoyl-L-2-aminobutanoyl-L-asparaginyl-L-tyrosyl-L-2-amino-, methyl ester H-.alpha.-Aminobutyric acid-.alpha.-Aminobutyric acid-Asn-Tyr-.alpha.-Aminobutyric acid-OCH3 H-Abu-Abu-Asn-Tyr-Abu-OCH3