Patent ID: 6858599

Claim:
A compound represented by formula (I) or its pharmaceutically acceptable salt wherein A is a hydrogen atom, or a group selected from (1) a saturated or unsaturated five- or six-membered cyclic hydrocarbon group, or a saturated or unsaturated five- or six-membered heterocyclic group, (2) an amino group, and (3) an imidoyl group (wherein the groups of (1) to (3) are optionally substituted); B is a single bond, a carbonyl group, —S(O) x —, or an optionally substituted C 1-2 alkylene group; D is a hydrogen atom, —CO—R 5 (wherein R 5 is a hydrogen atom or a substituent), or an optionally substituted C 1-6 alkyl group; X is a nitrogen atom or a methine group optionally substituted with a group A′-B′- (wherein A′ represents a group selected from those defined for A, and B′ represents a group selected from those defined for B); Y is an oxygen atom, —S(O) y —, or an optionally substituted imino group (—NH—); Z is a methylene group, a carbonyl group, or a thiocarbonyl group; T is —S(O) z —, a carbonyl group, or an optionally substituted C 1-2 alkylene group; Q is a hydrocarbon group or a heterocyclic group, which are optionally substituted; l, m, n, x, y, and z are independently an integer selected from 0, 1 and 2 with the proviso that 1 and m are not simultaneously 0; and r is an integer of 0 or 1; and the three rings (the ring containing X, the ring containing Y, and the ring containing Z) are independently optionally substituted; and the bond indicated by the broken line and the solid line in the ring containing Z is a single bond or a double bond (when r is 0).