Isoquinoline derivative

摘要

An isoquinoline derivative of the following formula: <IMAGE> (I) wherein R1 is a methyl or a methoxymethyl group and R2 and R3 are each a hydrogen atom or a methyl, ethyl, methoxy, a cyclohexyl, a phenyl, a 3,4-dimethoxyphenyl, a pyridyl or an oxo (=O) group; and therapeutically acceptable salts thereof which exhibit a low toxicity and a wide range of safety and are highly useful as a cardiotonic medication.