英文别名Levosimendan Dimer; 2-Pyrimidineacetonitrile, 4-amino-6-ethoxy-5-[2-[4-[(4R)-1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl]phenyl]diazenyl]-α-[2-[4-[(4R)-1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl]phenyl]hydrazinylidene]-; Zuosimendan impurity S 
