摘要：

A pharmaceutical or veterinary composition comprising a compound of formula I ##STR1## wherein X is a --CO.sub.2 H group and R. sub.1, R. sub. 2, R.sub.3, R.sub.4, R.sub.5 are as defined in the specification, or a salt, hydrate or solvate thereof, and a pharmaceutically or veterinarily acceptable excipient or carrier. A method of treatment of diseases or conditions mediated by MMPs in mammals, such as rheumatoid arthritis, osteoarthritis, periodontitis, gingivitis, corneal ulceration or tumour invasion by secondary means, by administering to the mammal an effective amount of the composition.

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