(2S)-N-(3-{(2S)-2-[N-(tert-Butyl)carbamoyl]piperidyl}(1S,2R)-2-hydroxy-1-benzylpropyl)-3-carbamoyl-2-[(phenylmethoxy)carbonylamino]propanamide AIDS-032542 AIDS032542 Ro 31-8959 deriv. Z-Asn-Phe-psi [CH(OH)CH2N]PIC-NH-tBu