A compound represented by the following general formula (1) or a salt thereof, which has superior inhibitory activity against type 4 PLA.sub.2, and thus has prostaglandin and/or leucotriene production suppressing action [X represents a halogen atom, an alkyl group which may be substituted, or the like, Y represents hydrogen atom or an alkyl group which may be substituted, and Z represents hydrogen atom or an alkyl group which may be substituted]. ##STR00001##