摘要 |
<p>TITLE OF THE INVENTION. PYRIDAZINONE DERIVATIVES AND SALTS THEREOF There are provided novel pyridazinone derivatives having the general formula (I): (I) wherein A represents 5- or 6-membered heterocyclic ring having 1 - 3 nitrogen atoms, which may be substituted by at least one member selected from the group consisting of C1-5 alkyl, cyano, hydroxyl, C1-5 alkoxyl, amino, C1-5 alkylamino, C2-6 dialkylamino, C2-5 acylamino, carboxyl, C2-5 alkoxycarbonyl and carbamoyl, and R1 and R2 independently represent hydrogen atom or C1-5 alkyl or R1 and R2 may form together C1-5 alkylene, and salts thereof. They are useful as a cardiac stimulant.</p> |
申请人 |
MITSUBISHI CHEMICAL INDUSTRIES LIMITED |
发明人 |
OKUSHIMA, HIROMI;NARIMATSU, AKIHIRO;KOBAYASHI, MAKIO;FURUYA, RIKIZO;KITADA, YOSHIMI |