prov:value
| - up, a C1 -C4 alkyl group, a C1 -C4 alkoxy group, a C2 -C4 alkenyl group, a C2 -C4 alkynyl group, a C3 -C5 alkenyloxy group or a C3 -C5 alkynyloxy group, or R6 and R7 may together form a ring which may contain a hetero atom), R3 is a hydrogen atom, a halogen atom, a C1 -C6 alkyl group, a phenyl group, a substituted phenyl group, a benzyl group, a substituted benzyl group, a benzoyl group, a substit
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