4-Amino-N-{(2R)-2-hydroxy-2-[(8S,11S)-8-isopropyl-6,9-dioxo-2-oxa-7,10-diazabicyclo[11.2.2]heptadeca-1(15),13,16-trien-11-yl]ethyl}-N-(3-methylbutyl)benzenesulfonamide AIDS-051273 AIDS051273 Macrocylic deriv.