Benzopyrones of the formula ##STR1## wherein R.sub.1 is a hydrogen or halogen atom or a hydroxyl, lower alkyl, alkoxy, alkylthio or trifluoromethyl radical, R.sub.2, r.sub.3, r.sub.4 and R.sub.5 each independently is hydrogen, a halogen atom, a hydroxyl radical, a lower alkyl or lower alkoxy radical, or a lower alkyl or lower alkoxy radical substituted by at least one of hydroxyl, halogen, mesyloxy or tosyloxy or by an oxirane, dioxane or dioxolane ring, A is a lower alkylene radical, and n is 0, 1 or 2, And salts thereof exhibit anti-allergic activity.
苯并
吡喃酮的
化学式为##STR1##,其中R.sub.1是氢原子或卤素原子或羟基、低烷基、烷氧基、烷
硫基或三
氟甲基基团,R.sub.2、r.sub.3、r.sub.4和R.sub.5分别是氢、卤素原子、羟基基团、低烷基或低烷氧基基团,或者被至少一个羟基、卤素、甲磺氧基或对
甲苯磺氧基取代的低烷基或低烷氧基基团,或者被环氧环、二氧杂
环戊烷环或二氧杂环已取代的低烷基或低烷氧基基团,A为低烷基烯基基团,n为0、1或2,其盐具有抗过敏活性。