A compound represented by the following formula (1): ##STR00001## (wherein each of R.sub.1 and R.sub.2, which may be identical to or different from each other, represents a hydrogen atom, a methyl group, or an ethyl group; each of R.sub.3a, R.sub.3b, R.sub.4a, and R.sub.4b, which may be identical to or different from each other, represents a hydrogen atom, a halogen atom, a nitro group, a hydroxyl group, a C.sub.1-4 alkyl group, a trifluoromethyl group, a C.sub.1-4 alkoxy group, a C.sub.1-4 alkylcarbonyloxy group, a di-C.sub.1-4 alkylamino group, a C.sub.1-4 alkylsulfonyloxy group, a C.sub.1-4 alkylsulfonyl group, a C.sub.1-4 alkylsulfinyl group, or a C.sub.1-4 alkylthio group, or R.sub.3a and R.sub.3b, or R.sub.4a and R.sub.4b may be linked together to form an alkylenedioxy group; X represents an oxygen atom, a sulfur atom, or N--R.sub.5 (R.sub.5 represents a hydrogen atom, a C.sub.1-4 alkyl group, a C.sub.1-4 alkylsulfonyl group, or a C.sub.1-4 alkyloxycarbonyl group); Y represents an oxygen atom, S(O).sub.l (l is a number of 0 to 2), a carbonyl group, a carbonylamino group, an aminocarbonyl group, a sulfonylamino group, or an aminosulfonyl group; Z represents CH or N; n is a number of 1 to 6; and m is a number of 2 to 6) or a salt thereof; and therapeutic drugs containing any of such a compound or salt.