Patent ID: 7563811

Claim:
A compound as represented by the following formula (I): wherein one of X 1 , X 2 and X 3 indicates a single bond and the others independently indicate a single bond or an optionally substituted C 1-6 alkylene group, an optionally substituted C 2-6 alkenylene group, an optionally substituted C 2-6 alkynylene group, —O—, —S—, —CO—, —SO—, —SO 2 —, —N(R 6 )—, —N(R 7 )—CO—, —CO—N(R 8 )—, —N(R 9 )—CH 2 —, —CH 2 —N(R 10 )—, —CH 2 —CO—, —CO—CH 2 —, —N(R 11 )—S(O) m —, —S(O) n —N(R 12 )—, —CH 2 —S(O) p —, —S(O) q —CH 2 —, —CH 2 —O—, —O—CH 2 —, —N(R 13 )—CO—N(R 14 )— or —N(R 15 )—CS—N(R 16 )— wherein R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 and R 16 independently indicate a hydrogen atom, a C 1-6 alkyl group or a C 1-6 alkoxy group; and m, n, p and q are independent of each other and each independently indicates an integer of 0, 1 or 2, provided that X 1 , X 2 and X 3 do not indicate a single bond at the same time; A 1 , A 2 and A 3 are the same as or different from each other and each independently indicates an optionally substituted C 3-8 cycloalkyl group, an optionally substituted C 3-8 cycloalkenyl group, an optionally substituted 5 to 14-membered non-aromatic heterocyclic group selected from the group consisting of pyrrolidinyl groups, piperidinyl groups, piperazinyl groups, and morpholinyl groups, an optionally substituted C 6-14 aromatic hydrocarbocyclic group selected from the group consisting of phenyl groups and naphthyl groups, an optionally substituted 5 to 14-membered aromatic heterocyclic group selected from the group consisting of pyrrolyl groups, pyridyl groups, pyrimidinyl groups, pyraziny groups, thienyl groups, thiazolyl groups, furyl groups, guinolyl groups, isoquinolyl groups, indolyl groups, benzimidazolyl groups, benzothiazolyl groups, benzoxazolyl groups, imidazopyridyl groups, carbazolyl groups, and dioxinyl groups, or an adamantyl group; and R 17 and R 18 are the same as or different from each other and each independently indicates a hydrogen atom, a halogen atom or a C 1-6 alkyl group, or a salt thereof.