4b',7a'-Dihydro-4a'H-spiro(furan-3,8'-furo(3',4':3,4)pyrrolo(1,2-b)pyridazine)-2,5,5',7'(4H)-tetrone;4b',7a'-Dihydro-4a'H-spiro[furan-3,8'-furo[3',4':3,4]pyrrolo[1,2-b]pyridazine]-2,5,5',7'(4H)-tetrone
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