1-{(2R)-2-[(11S,14S)-14-(2-Amino-2-oxoethyl)-13,16-dioxo-3,4,11,12,13,14,15,16-octahydro-2H,10H-6,9-ethenonaphtho[2,3-b][1,15,5,8]dioxadiazacyclooctadecin-11-yl]-2-hydroxyethyl}-N-(tert-butyl)-L-prolinamide 2-Napth-Asn-Phe-.psi.-(COHCH2N)-Pro-NH-tbut 18-member macrocyclic AIDS-057825 AIDS057825