The ability of a substance to increase the force of muscular contractions in the heart.
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8-benzyl-4-(2-hydroxyethyl)-amino-2-methyl-6,7-dihydro-8H-pyrimido[5,4-b][1,4]oxazin-7-one
2-Phenyl-5-(3-oxo-2,3,4,5-tetrahydro-6-pyridazinyl)-indole
