| abstract |
An N-acyl anthranilic acid derivative represented by general formula (1) or a salt thereof is useful for prevention or treatment of diseases associated with excessive production of collagen. (In the formula, R 1 represents a carboxyl group or the like; R 2 represents a hydrogen atom or the like; R 3 represents an optionally substituted aryl group or the like; X 1 represents a carbonyl group; X 2 represents a bonding hand; X 3 represents a bonding hand; X 4 represents a bonding hand or the like; and A represents an optionally substituted phenyl group or the like.) |