(S)-3(2h)-Pyridazinone, 6-(4-Aminophenyl)-4,5-Dihydro-5-Methyl-

(5S)-6-(4-Aminophenyl)-4,5-dihydro-5-methyl-3(2H)-pyridazinone is an intermediate in the synthesis of Dextrosimendan (D299550), an isomer and impurity of Levosimendan (L378000), a bioactive enantiomer of Simendan (S466000). Levosimendan is a positive inotropic agent with vasodilating activity.