[2aR-[2a alphaa,4beta,4a beta,6beta,9alpha,(alphaR*,betaS*),-11alpha,12alpha,12a alpha,12b alpha]]-beta-[[(1,1-dimethylethoxy)carbonyl]-amino]-alpha-hydroxybenzemepropanoic Acid 12b-(Acetyloxy)-12(benzyloxy)-2a,3,4,4a,5,6,8,10,11,12,12a,12b-dodecahydeo-4,-6,11-trihydroxy-4a,8,13,13-tetramethyl-5-oxo-7,11-methano-1H-cyclodeca[3,4]benz[1,2-b]oxet-9-yl Ester