An antiallergic agent with a low toxicity and an excellent efficacy, containing a benzopyran derivative represented by general formula (I) as the active ingredient, wherein R¹ and R² represent each hydrogen, acyl, C₁ to C₁₂ alkyl or C₂ to C₁₀ alkenyl; and R³ represents hydroxy, acyloxy, C₁ to C₁₀ alkoxy or C₂ to C₁₀ alkenyloxy.
一种低毒、高效的抗过敏剂,含有通式(I)代表的苯并
吡喃衍
生物作为活性成分,其中R¹和R²分别代表氢、酰基、C₁至C₁₂烷基或C₂至C₁₀烯基;和 R³ 代表羟基、酰氧基、C₁至 C₁₀ 烷氧基或 C₂ 至 C₁₀ 烯氧基。