36262-53-0;NSC145692;AC1L4938;NSC 145692;NSC-145692;3'-methylidenespiro[fluorene-9,5'-oxolane]-2'-one;3-Methylene-6,7:8,9-dibenz-1-oxaspiro(4.4)nonan-2-one;Spiro(9H-fluorene-9,2'(5'H)-furan)-5'-one, 3',4'-dihydro-4'-methylene-
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