1-{(2R)-2-[(12S,15S)-15-(2-Amino-2-oxoethyl)-14,17-dioxo-2,3,4,5,12,13,14,15,16,17-decahydro-11H-7,10-ethenonaphtho[2,3-b][1,15,5,8]dioxadiazacyclononadecin-12-yl]-2-hydroxyethyl}-N-(tert-butyl)-L-prolinamide 2-Npth-Asn-Phe-.psi.-(COHCH2N)-Pro-NH-tbut 19-member macrocyclic AIDS-059184 AIDS059184