1-(1,3-Dihydro-5,6-dimethoxy-3-oxoisobenzofuran-1-yl)cinnolin-4(1H)-one 1-(5',6'-Dimethoxy-3'-oxo-1',3'-dihydroisobenzofuran-1'-yl)cinnolin-4(1H)-one 81023-04-3 BRN 5142932 CINNOLIN-4(1H)-ONE, 1-(1,3-DIHYDRO-5,6-DIMETHOXY-3-OXOISOBENZOFURAN-1-YL)-