AIDS-004851 AIDS004851 Boc-(S)-Asn-(S)-Phe-.psi.-[(R)-P(OMe)O-N]-(S)-Pro(S)-IIe-NH-i-Bu Boc-(S)-Asn-(S)-Phe-.psi.-[(R)-P(OMe)O-N]-(S)-Pro(S)IIe-NH-i-Bu