Coumarin derivatives, process for preparing the same and pharmaceutical composition containing the same.

摘要

Coumarin derivatives of the general formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="16" wi="40" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein R is hydrogen atom, an alkyl group or an alkenyl group, R<Sup>1</Sup> is hydrogen atom, an alkyl group, an alkenyl group or an alkoxyl group, and the OR and R<Sup>1</Sup> groups each are substituted at any of the 5,6, and 8 positions of the coumarin ring, and the salt thereof. The compounds are useful as antiallergic agent for preventing and treating allergic diseases.