There is provided a compound of formula (I) wherein Z is selected from N and CR22, wherein R22 is H or a bond with D, wherein D is selected from a bond, C=O, and linear or branched hydrocarbon groups having a carbon chain of from 1 to 6 carbon atoms, wherein the carbon chain optionally contains an oxy group (=0), an ether (-0-) or thioether (-S-) link, wherein R1 is selected from :triazolyl, imidazolyl, pyrimidinyl radical wherein each of R2 to R6 is independently selected from -H, NO2, halo, -CN, -N[(C=O)0-1R12][(C=O)0-1R13] and -(CH2)0-1R14, or two adjacent groups of R2 to R6, together with the carbon atoms to which they are attached, form a ring, wherein at least one of R2 to R6 is -CN, wherein (i) at least one of R2 to R6 is -(CH2)0-1R14, or (ii) at least one of R2 to R6 is -N[(C=O)0-1, R12][(C=O)0-1R13], or (iii) at least two adjacent groups of R2 to R6 together with the carbon atoms to which they are attached, form a ring, or (iv) at least one of R2 to R6 is -(CH2)0-1O-R14, wherein R12 and R13 are independently selected from H, linear or branched hydrocarbon groups having a carbon chain of from 1 to 10 carbon atoms, or together with the atoms to which they are attached, may form a mono or bicyclic ring having from 5 to14 ring members wherein R14 is selected from: aliphatic ring systems unsubstituted or substituted monocyclic aliphatic heterocycles unsubstituted or substituted heteroaryl radical, and unsubstituted or substituted phenyl group the group of formula (a) wherein t is 1 or 2, wherein R14 is a unsubstituted or substituted phenyl group, wherein each of R7 to R11 is independently selected from -H, NO2, halo, -O-(C1-C6)haloalkyl, (C1-C6)haloalkyl, (C1-C6)alkyl, -CN, -OH, -OPh, -OBn, -Ph, -OSO2NR15R16, -SO2R26, -SO2NR27NR28, -O-(C1C6)alkyl, -(C=O)0-1NR29R30 and -CO(O)0-1R31 wherein R15 and R16 are independently selected from H, alkyl, cycloalkyl, alkenyl, acyl and aryl, or combinations thereof, or together represent alkylene, wherein the or each alkyl or
