3-(tetrazol-5-y1)-1-azaxanthones

Abstract From the Canadian patent

3-(Tetrazol-5-yl)-1-Azaxanthones, Abstract of the disclosure Novel 3-(tetrazol-5-yl)-1-azaxanthone and its derivatives, which are shown by the following formula wherein R1 is hydrogen, amino or hydroxyl; R2 is alkyl alkoxy, halogen, nitro, carboxyl, hydroxyl butadienylene, (-CH=CH-CH=CH-) which forms a benzene ring with any adjacent carbon atoms or amino group which may be unsubstituted or substituted by at least one alkyl; and m is 0 1 or 2; and, their physiologically acceptable salts are usable as, effective medicines for preventing and/or treating allergic diseases.