prov:value
| - C1 -C40 -group such as a C1 -C10 -alkyl group, a C1 -C10 -alkoxy group, a C6 -C10 -aryl group, a C6 -C25 -aryloxy group, a C2 -C10 -alkenyl group, a C7 -C40 -arylalkyl group or a C7 -C40 -arylalkenyl group, an OH group, a halogen atom or NR15 2, where R15 is a halogen atom, a C1 -C10 -alkyl group or a C6 -C10 -aryl group, or R1 and R2 together with the atoms connecting them form a ring system,
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