(2aα,4aα,5aR*,7α,9aR*,9bR*,9cα,10aα)-(+/-)-7-ethenyldecahydro-2a,7-dimethyl-5a,9a-epoxy-3H-cyclopropa(4,4a)phenanthro(10,1-bc)furan-3,5(1H)-dione

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