3'-amino-2,6',8'-trioxo-5',6',7',8'-tetrahydro-2H-spiro[acenaphthylene-1,1'-pyrano[2,3-d]pyrimidine]-2'-carbonitrile
7'-amino-2,2',4'-trioxo-1',2',3',4'-tetrahydro-2H-spiro[acenaphthylene-1,5'-pyrano[2,3-d]pyrimidine]-6'-carbonitrile
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