2,7-Ethanonaphth[2,3-b]oxirene-8,9-dione,1a,2,7,7a-tetrahydro-,(1aalpha,2bta,7bta,7aalpha)-(9CI);2,7-Ethanonaphth[2,3-b]oxirene-8,9-dione, 1a,2,7,7a-tetrahydro-, (1aalpha,2ba,7ba,7aalpha)- (9CI)
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