AIDS-004852 AIDS004852 Boc-(S)-Asn-(R)-Phe-.psi.-[(R)-P(OMe)O-N]-(S)-Pro(S)-IIe-NH-i-Bu Boc-(S)-Asn-(R)-Phe-.psi.-[(R)-P(OMe)O-N]-(S)-Pro(S)IIe-NH-i-Bu