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(1S,3aS,3bS,9aR,9bS,11aS)-1-Isopropylcarbamoyl-9a,11a-dimethyl-7-oxo-1,2,3,3a,3b,4,7,8,9,9a,9b,10,11,11a-tetradecahydro-cyclopenta[i]phenanthridine-5-carboxylic acid tert-butyl ester
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