((4-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl)hydrazono\r\n)propanedinitrile (-)-OR-1259 (R)-((4-(1,4,5,6-Tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl)hydrazono)propanedinitrile 141505-33-1 LEVOSIMENDAN Levosimendan [INN] Mesoxalonitrile (-)-(p((R)-1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl)hydrazone Simdax