Compounds of the invention are of the formulawherein: is a double bond and X is C； or is a single bond and X is N, CH or CQR1； andwherein:n is 1 to 10；R is H or QR1；each R′ is independently selected from H and QR1；each Q is independently selected from a bond, CO, NH, S, SO, SO2 or O；each R1 is independently selected from C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, substituted or unsubstituted aryl or heteroaryl, acyl, C1-C10 cycloalkyl, halogen, C1-C10 alkylaryl or C1-C10 heterocycloalkyl；L is a nitrogen-containing heteroaryl； andW is a zinc-chelating residue；or a pharmaceutically acceptable salt thereof. The compounds are useful in therapy.
