(4,9-Dimethoxy-5H-furo(3,2-g)(1)benzopyran-5-on-7-yl)methylenehydrazide 201747-20-8 4,9-Dimethoxy-5-oxo-5H-furo(3,2-g)(1)benzopyran-7-carboxaldehyde 7-hydrazone 5H-Furo(3,2-g)(1)benzopyran-7-carboxaldehyde, 4,9-dimethoxy-5-oxo-, 7-hydrazone