Pimobendan74150-27-9100 % similar (5R)-6-(4-Aminophenyl)-4,5-dihydro-5-methyl-3(2H)-pyridazinone101328-85-245 % similar Levosimendan141505-33-138 % similar 2-Mercapto-5-methoxybenzimidazole37052-78-131 % similar 2-(4-Aminophenyl)-5-aminobenzimidazole7621-86-531 % similar