[2aR[2aalpha,4beta,4abeta,6beta,9alpha(2R,3S),11beta,12alpha,12aalpha,12balpha]]-12b-Acetoxy-9-[3-(tert-butoxycarbonylamino)-2-hydroxy-3-phenylpropionyloxy]-12-(benzoyloxy)-11-hydroxy-4,6-dimethoxy-4a,8,13,13-tetramethyl-2a,3,4,4a,5,6,9,10,11,12,12a,12b-d