NOVEL BENZOPYRAN DERIVATIVES AND AN ANTI-ALLERGIC AGENT POSSESSING THE SAME AS THE ACTIVE INGREDIANT

摘要

The present invention relates to an extremely effective anti-allergic; agent with a :Low toxicity, which possesses as its active ingredient a benzopyran derivative described by the above general formula (in the formula, R 1 and R 2 are each independently a hydrogen atom, an acyl group, a straight chained or branched alkyl group having 1~12 carbon atoms, or a straight chained or branched alkenyl group having 2~12 carbon atoms; and R 3 is a hydroxyl group, an acyloxy group, an alkoxy group having 1~10 carbon atoms, or an alkenyloxy group having 2~10 carbon atoms).