Patent ID: 7241921

Claim:
A compound of formula (I), or a salt or hydrate thereof: wherein: Z represents a radical of formula —N(OH)CH(═O) or formula —C(═O)NH(OH); R 1 represents hydrogen, methyl or trifluoromethyl or, except when Z is a radical of formula —N(OH)CH(═O), a hydroxy, halo or amino group R 2 represents hydrogen or a group R 10 —(D) n —(ALK) m — wherein R 10 represents an optionally substituted C 1 –C 6 alkyl, C 2 –C 6 alkenyl, C 2 –C 6 alkynyl, cycloalkyl, aryl, or heterocyclyl group and ALK represents a straight or branched divalent C 1 –C 6 alkylene, C 2 –C 6 alkenylene, or C 2 –C 6 alkynylene radical, and may be interrupted by one or more non-adjacent —NH—, —O— or —S— linkages, D represents —NH—, —O— or —S—, and n is 0 or 1; R 3 and R 4 independently represent hydrogen or a group R 10 (D) n (ALK) m — as defined for R 2 , or R 3 and R 4 taken together with the nitrogen atom to which they are attached form an optionally substituted monocyclic heterocyclic ring containing from 5 to 7 ring atoms, one of which is the nitrogen atom to which R 4 and R 5 are attached and the remaining ring atoms being selected from compatible combinations of carbon, oxygen, sulfur and nitrogen.