3- Or 4-glycosyloxybenzopyran derivative and antiallergic agent containing the derivative as active ingredient

摘要

There are provided novel 3-glycosyloxybenzopyran derivative of the following formula (I) and novel 4-glycosyloxybenzopyran derivative of the following formula (II): and their pysiologically acceptable salts. The compounds according to the present invention and their pysiologically acceptable salts exhibit an antiallergic activity, and are expected to be useful as a drug treating allergic diseases.