Isoxazolin-3-one derivatives of formula (I):
 [in which: R¹ is hydrogen or halogen; R² is C₁ - C₄ alkyl, optionally substituted phenyl or heterocyclic; or R¹ and R² together form a hydrocarbon ring; R³ is hydrogen or C₁ - C₄ alkyl; and R⁴ is C₁ - C₄ alkyl; or R³ and R⁴, together with the adjacent nitrogen, form a cycloaliphatic amino group] and pharmacoligically acceptable acid addition salts thereof have been found to have a direct effect on the cerebral circulation and/or metabolism, and they can be used in the treatment of cerebrovascular disorders.  
                            式(I)的
异噁唑啉-3-酮衍
生物:
 其中R¹ 为氢或卤素;R² 为 C₁ - C₄ 烷基、任选取代的苯基或杂环;或 R¹ 和 R² 共同形成一个烃环;R³ 为氢或 C₁ - C₄ 烷基;R⁴ 为 C₁ - C₄ 烷基;或 R³ 和 R⁴ 与邻近的氮一起形成环脂族
氨基]及其药理上可接受的酸加成盐已被发现对脑循环和/或新陈代谢有直接作用,可用于治疗脑血管疾病。