a substance that affects the contractility of the heart muscle and is used to treat heart failure and other cardiac conditions
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6-(4-Imino-3-phenyl-3,4-dihydro-quinazolin-7-yl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one
2-Phenyl-5-(3-oxo-2,3,4,5-tetrahydro-6-pyridazinyl)-indole
