1-(3,4-Dimethoxyphenyl)-3-methoxy-4(1H)-pyridazinone 146824-89-7 4(1H)-Pyridazinone, 1-(3,4-dimethoxyphenyl)-3-methoxy- Dimethoxy-3,4 phenyl-1 dihydro-1,4 oxo-4 methoxy-3 pyridazine [French]