[2aR-[2aalpha,4beta,4abeta,6beta,9alpha(2R,3S),10beta,11beta,12alpha,12aalpha,12balpha]]-6,12b-Diacetoxy-9-[3-(tert-butoxycarbonylamino)-3-[2,2-dimethyl-1(R)-cyclopropyl]-2-hydroxypropionyloxy]-10,11-(carbonyldioxy)-4-hydroxy-4a,8,13,13-tetramethyl-2a,3,4