Patent ID: 7659426

Claim:
A compound represented by the formula (I) or the formula (II) or a pharmaceutically acceptable salt thereof: wherein X is ring A is an optionally substituted saturated or unsaturated cyclic hydrocarbon group or saturated or unsaturated heterocyclic group; ring B is a benzene ring optionally further having one to four substituents; R 1 is an optionally substituted lower alkyl group, an optionally substituted aryl group, a substituted amido group or an optionally substituted amino group, wherein in the formula (I), when X is —SO 2 —, R 1 is not —NH 2 —; each of R 2 to R 4 , whether identical or not, is a hydrogen atom, a saturated or unsaturated hydrocarbon group or a saturated or unsaturated heterocyclic group (R 3 and R 4 may bind together to form a ring), except that the compounds shown below are excluded