Synonyms: NSC286121;63159-39-7;Spiro(4H-1-benzothiopyran-4,2'(5'H)-furan)-5'-one, 2,3,3',4'-tetrahydro-4'-methylene-, 1,1-dioxide;Spiro[4H-1-benzothiopyran-4,2'(5'H)-furan]-5'-one, 2,3,3',4'-tetrahydro-4'-methylene-, 1,1-dioxide;AC1L8945;NSC 286121;NSC-286121;NCI60_002342;3'-methylidene-1,1-dioxospiro[2,3-dihydrothiochromene-4,5'-oxolane]-2'-one