Mitsubishi Kasei Corporation

Hitoshi Miida

Kazuo Takahashi

Mikio Tsutsui

Tomei Oguri

Yosio Hayasi

Masaki Shimoda

Disclosed are a thiazole derivative represented by the following formula, a pharmaceutically acceptable salt thereof and leukotriene antagonist containing the same as the active ingredients: ##STR1## wherein R.sub.1 and R.sub.2 each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a lower alkoxycarbonyl group or a substituted or unsubstituted phenyl group or cooperatively represent a tetramethylene group corresponding to a fused cyclohexane ring or a butadienylene group which is unsubstituted or substituted with a halogen atom, a lower alkoxy group, a lower alkoxycarbonyl group or an alkyl group having 1 to 3 carbon atoms corresponding to a fused benzene ring; R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each independently represent a hydrogen atom, a hydroxyl group, a lower alkoxy group, an alkyl group having 1 to 3 carbon atoms or a halogen atom; A represents a linking group having 2 to 4 chain members; B represents a linking group having 2 to 5 chain members; and Q represents a carboxyl group, a lower alkoxy group, a hydroxyl group, an alkoxycarbonyl group having 2 to 6 carbon atoms or a 5-tetrazolyl group.

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Tsuchiura, Japan

Hitoshi Miida