ChemInform Abstract: SYNTHESIS OF 4,10-DIHYDRO-4,10-DIOXO-1H-(1)-BENZOPYRANO(3,2-B)PYRIDINE, 4,5-DIHYDRO-4,5-DIOXO-1H-(1)-BENZOPYRANO(2,3-B)PYRIDINE AND 1,5-DIHYDRO-1,5-DIOXO-4H-(1)-BENZOPYRANO(3,4-B)PYRIDINE DERIVATIVES FROM AMINOBENZOPYRONES

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