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organic compounds
The X-ray crystal structure determination of the title compound (C20H22BrNO5, systematic name methyl 14-bromo-6-methoxy-1,3-dioxo-2,3,3a,9,10,11,12,13,13a,13b-decahydro-1H-8,12-methanocyclodeca[e]isoindol-12-yl acetate), an ABC-ring analogue of the diterpene paclitaxel reveals that the stereochemical relationships between C(3), C(4) and C(5) (C13a, C13b and C3a, respectively, by systematic numbering) are the same as observed in the natural product.