Novel pyrazine derivatives represented by the formula (1) and salts thereof which possess inhibitory effect against superoxide radicals (O.sub.2.sup.-) released from the macrophage cells of guinea pig by stimulation, and also possess anti-albuminuria activity in Masugi nephritis. ##STR1## The pyrazine derivatives (1) and salts thereof are useful agents for preventing and treating of various diseases caused by the superoxide radicals, for example, diseases of autoimmune such as rheumatoid arthritis, arteriosclerosis, ischemic heart disease, transient cerebral ischematic attack, hepatic insufficiency, renal insufficiency and the like, as well as they are useful agents for preventing and treating the nephritis in various clinical fields.
化合物(1)及其盐是一种新型
吡嗪衍
生物,具有抑制豚鼠巨噬细胞刺激后释放的超氧自由基(O.sub.2.sup.-)的能力,并具有抗马杉肾炎的活性。##STR1## 这些
吡嗪衍
生物(1)及其盐是预防和治疗由超氧自由基引起的各种疾病的有用药物,例如自身免疫性疾病如类风湿性关节炎、动脉硬化、缺血性心脏病、短暂性脑缺血发作、肝功能不全、肾功能不全等,它们也是在各种临床领域预防和治疗肾炎的有用药物。