4-Bromo-benzoic acid (3S,3aS,5R,5bR,6S)-5-acetoxy-6-methoxymethyl-3a,5b-dimethyl-8,11-dioxo-2,3,3a,4,5,5b,11,11b-octahydro-1H,6H,8H-7,10-dioxa-cyclopenta[j]acephenanthrylen-3-yl ester
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