(4aR,4bS,8aR)-2,2-dimethyl-1,2,3,4,4a,4b,8a,9-octahydro-1,3-methanophenanthrene-5,8-dione ;2,2-dimethyl-1,2,3,4,4a,4b,8a,9-octahydro-1,3-methanophenanthrene-5,8-dione
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