11a',11b'-Dihydro-11'H-spiro(furan-3,8'-furo(3',4':3,4)pyrrolo(2,1-a)phthalazine)-2,5,9',11'(4H,8a'H)-tetrone;11a',11b'-Dihydro-11'H-spiro[furan-3,8'-furo[3',4':3,4]pyrrolo[2,1-a]phthalazine]-2,5,9',11'(4H,8a'H)-tetrone
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