Abstract: Compound of the formula wherein R represents OH or NHOH; R1 represents hydrogen, optically substituted lower alkyl, aryl-lower alkyl, cycloalkyl-lower alkyl, or acyl derived from a carboxylic acid, from a carbonic acid, from a carbamic acid or from a sulfonic acid; R2 represents biarylsulfonyl or aryloxyrylsulfonyl; R3 represents hydrogen, optionally substituted lower alkyl, aryl-lower alkyl, cycloalkyl-lower alkyl or acyl derived from a carboxylic acid, from a carbonic acid or from a carbamic acid; R4 and R5 represent independently hydrogen, lower alkyl, lower alkoxycarbonyl, aryl-lower alkyl or cycloalkyl-lower alkyl; m is zero, 1, 2 or 3; pharmaceutically acceptable prodrug derivatives thereof; pharmaceutically acceptable salts thereof; pharmaceutical compositions comprising said compounds; and their use for inhibiting matrix degrading metalloproteinases and preventing or treating matrix metalloproteinase dependent conditions in mammals.