| http://www.w3.org/ns/prov#value | - R2 is a single bond or a divalent linking group of the general formula (2): R3 to R9 are each independently hydrogen or a straight, branched or cyclic C1-C12 alkyl or fluoroalkyl group which may contain an ether, lactone, ester, hydroxy or cyano group, R10 and R11 are each independently a straight, branched or cyclic C1-C10 alkyl group, R12 is a single bond, oxygen atom or C1-C4 alkylene group, a
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