Abstract: Compounds formula (IA) or (IB), wherein W represents HO(C?O)—, HONH(C?O)— or H(C?O)N(OH)—; X represents —O— or —S—; and R1, R2, and R3 are as defined in the description and claims, are inhibitors of matrix metalloproteinases, in particular MMP9 and/or MMP12.

Abstract: Compounds of formula (II) are antibacterial agents wherein Q represents a radical of the formula: —N(OH)CH(?O) or the formula: —C(?O)NH(OH); R1 represents hydrogen, C1-C6 alkyl or C1-C6 alkyl substituted by one or more halogen atoms, or, except when Q is a radical of the formula: —N(OH)CH(?O), a hydroxy, C1-C6 alkoxy, C1-C6 alkenyloxy, amino, C1-C6 alkylamino, or di-( C1-C6 alkyl)amino group; R2 represents a substituted or unsubstituted C1-C6 alkyl, cycloalkyl(C1-C6 alkyl)- or aryl(C1-C6 alkyl)-group; and A represents a group of formula (IIA), or (IIB) wherein R4 represents the side chain of a natural or non-natural alpha amino acid, and R5 and R6 when taken together with the nitrogen atom to which they are attached form a saturated heterocyclic first ring of 5 to 7 atoms as specified in the description.

Abstract: 1