131741-08-7 Mesoxalonitrile (+-)-(p-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl)hydrazone Propanedinitrile, ((4-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl)hydrazono)- Simendan Simendan [INN]