(2R,3S)-3-(N-Acetyl-L-seryl-L-leucyl-L-asparaginyl)amino-2-hydroxy-4-phenylbutyryl-L-prolyl-L-isoleucine methyl ester AIDS-071323 AIDS071323 Ac-Ser-Leu-Asn-(2R,3S)-AHPBA-Pro-Ile-OMe