1-{(2S)-2-[(8S,11S)-8-(2-Amino-2-oxoethyl)-4,5-dihydroxy-6,9-dioxo-2-oxa-7,10-diazabicyclo[11.2.2]heptadeca-1(15),13,16-trien-11-yl]-2-hydroxyethyl}-L-prolyl-L-isoleucyl-L-valinamide AIDS-051256 AIDS051256 Macrocylic deriv.