(2R/S,3R)-3-[(N-Acetylserinyl]leucinylasparaginyl)amino]-2-hydroxy-4-phenyl-1-(N-prolylisoleucinylphenylalaninemethylester)butane AIDS-043112 AIDS043112 Ac-Ser-Leu-Asn-Phe[CHOHCH2]Pro-Ile-Phe-OMe