An anthranilic acid derivative represented by the general formula (X) [wherein R
1
represents hydrogen or a carboxy-protecting group; R
2
represents optionally substituted phenyl, a heterocyclic group, etc.; R
3
represents optionally substituted phenyl, a monocyclic heterocyclic group, etc.; X
1
represents carbonyl, etc.; X
2
represents optionally substituted alkylene group, a bond, etc.; X
3
represents oxygen, a bond, etc.; and X
4
represents a group represented by the general formula -X
5
-X
6
- or -X
6
-X
5
- (wherein X
5
means oxygen, a bond, etc.; and X
6
means optionally substituted alkylene, a bond, etc.)] or a salt of the derivative. The derivative or salt has the inhibitory activity of MMP-
13
production and is hence useful as a therapeutic agent for articular rheumatism, osteoarthritis, cancer, etc.
An anthranilic acid derivative represented by the general formula (X) [wherein R1 represents hydrogen or a carboxy-protecting group; R2 represents optionally substituted phenyl, a heterocyclic group, etc.; R3 represents optionally substituted phenyl, a monocyclic heterocyclic group, etc.; X1 represents carbonyl, etc.; X2 represents optionally substituted alkylene group, a bond, etc.; X3 represents oxygen, a bond, etc.; and X4 represents a group represented by the general formula —X5—X6— or —X6—X5— (wherein X5 means oxygen, a bond, etc.; and X6 means optionally substituted alkylene, a bond, etc.)] or a salt of the derivative. The derivative or salt has the inhibitory activity of MMP-13 production and is hence useful as a therapeutic agent for articular rheumatism, osteoarthritis, cancer, etc.