Patent ID: 7977466

Claim:
A C-glycoside derivative of the following formula (I) or a salt thereof: wherein; A ring represents a benzene ring; X represents methylene; B ring represents a saturated or unsaturated eight to ten-membered bicyclic hetero ring which has 1 to 4 hetero atom(s) selected from N, S, and O and includes a benzene ring, and X is bonded to the B ring in a part other than the benzene ring included in the B ring; R 1 to R 4 individually represent a hydrogen atom, a lower alkyl, —C(═O)-lower alkyl, or -lower alkylene-aryl; R 8 , R 9 and R 11 individually represent a hydrogen atom; and —R 5 , R 6 , R 7 , and R 10 individually represent a hydrogen atom, a lower alkyl, a halogen, a halogen-substituted lower alkyl, —OH, ═O, —NH 2 , lower alkyl sulfonyl-, aryl sulfonyl-, -lower alkylene-OH, -lower alkylene-O-lower alkyl, -lower alkylene-O—C(═O)-lower alkyl, —COOH, —CN, —C(═O)—O-lower alkyl, —O-lower alkyl, —O-lower alkylene-OH, —O-lower alkylene-O-lower alkyl, —O-lower alkylene-COOH, —O-lower alkylene-C(═O)—O-lower alkyl, or —O-lower alkylene-NH 2 .