| abstract |
Novel benzothiazole derivatives of the formula (I):n wherein R¹ is a hydrogen atom, a lower alkyl group or a lower acyl group; X and Y are the same or different and are each a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, nitro group, amino group, cyano group, trifluoromethyl group, a group of the formula: -COOR² (wherein R² is a hydrogen atom, a lower alkyl group, an alkali metal, an alkaline earth metal, or a cation of amine), or a group of the formula: -CONR³R⁴ (wherein R³ and R⁴ are the same or different and are each a hydrogen atom or a lower alkyl group) or a pharmaceutically acceptable acid addition salt thereof, which have excellent anti-allergic activity and are useful for the prophylaxis and treatment of various allergic diseases, and a pharmaceutical composition containing the compound as set forth above as an active ingredient. |