| http://www.w3.org/ns/prov#value | - preferably, R14, R15 and R16 are identical and are a hydrogen atom, a halogen atom, a C1???C4 alkyl group, a CF3 group, a C6???C8 aryl group, a C6???C10 fluoroaryl group, more preferably a pentafluorophenyl group, a C1???C4 alkoxy group, in particular a methoxy group, a C2???C4 alkenyl group, a C7???C10 arylalkyl group, a C9???C12 arylalkenyl group, or a C7???C14 alkylaryl group;
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