AIDS-051286 AIDS051286 Macrocylic deriv. {(1S,2R)-1-Benzyl-3-[(8S,11S)-8-(2-carbamoyl-ethyl)-7,10-dioxo-2-oxa-6,9-diaza-bicyclo[11.2.2]heptadeca-1(16),13(17),14-trien-11-ylamino]-2-hydroxy-propyl}-carbamic acid tert-butyl ester