1,2,3,4-Tetrahydro-4a,9a-epoxy-1,4-methanoanthracene-9,10-dione;15-Oxapentacyclo[8.4.1.1~11,14~.0~1,10~.0~3,8~]hexadeca-3,5,7-triene-2,9-dione;4a,9a-epoxy-1,4-methanoanthracene-9,10-dione, 1,2,3,4-tetrahydro-
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