Described is a substituted fused heterocyclic compound which is represented by the following formula:
[wherein R1 represents a group of the following formula:
(in which R4: a substituted phenyl or a pyridyl which may have a substituent, R5: a hydrogen atom or the like, R6: a hydrogen atom, a C1-6 alkyl group or the like, D: an oxygen or sulfur atom, E: a CH group or a nitrogen atom, R2: a hydrogen atom or the like, R3: a 2,4-dioxothiazolidin-5-ylmethyl group or the like; A: a C1-6 alkylene group, and B: an oxygen or sulfur atom] or a pharmacologically acceptable salt thereof; and has excellent insulin-resistance improving action, lipid-peroxide-production inhibitory action, 5-lipoxygenase inhibitory action and the like.
Substituted fused heterocyclic compounds of the formula (I) and pharmacologically acceptable salts thereof:
wherein R1 is a group of the formula (II) or (III):
R4 is a substituted phenyl or a pyridyl which may have a substituent. R5 is hydrogen or the like. R6 is hydrogen, a C1-6 alkyl group or the like. D is oxygen or sulfur. E is a CH group or nitrogen. R2 is hydrogen or the like. R3 is a 2,4-dioxothiazolidin-5-ylmethyl group or the like. A is a C1-6 alkylene group. B is oxygen or sulfur. These compounds and salts are useful as the active ingredient of pharmaceutical compositions which can be used to treat patients because these compounds and salts have excellent insulin-resistance improving action, lipid-peroxide-production inhibitory action, 5-lipoxygenase inhibitory action and the like.