1-{(2S)-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-hydroxyacetyl}-N-(tert-butyl)-L-prolinamide AIDS-057822 AIDS057822 Norstatin deriv.