| 摘要 |
Disclosed is a heterocyclic ring compound which is useful as an anti-allergic agent. Specifically disclosed is a compound represented by formula (1) or a salt thereof. (In the formula, the ring A represents an isocyclic or heterocyclic ring; the ring B represents a heterocyclic ring containing G and a nitrogen atom N as the ring-constituting atoms, wherein G in the ring B represents CH or N; R1 represents a carbonyl group or an alkylene group; R2a and R2b independently represent an alkyl group, a cycloalkyl group, an aryl group or a heterocyclic ring group; X represents an oxygen atom or a sulfur atom; Z represents a hydroxyl group, an alkoxy group, a cycloalkyloxy group, an aryloxy group, an aralkyloxy group, an amino group, or an N-substituted amino group; and n represents 0 or 1, wherein R1 represents an alkylene group which may have a substituent when the ring A represents a benzene ring or the ring B represents a piperazine ring.) |
