prov:value
| - wherein R7 and R8 are identical or different and each is hydrogen or C1 -C4 alkyl, each of R9 and R10, independently of the other, is a hydrogen or halogen atom, and T is methylene, 2,2-propylidene, --CO--, --O--, --S-- or--SO2 --, B) a compound of formula II, III or IV ##STR16## wherein each of R11, R12 and R13, independently of the others, is a hydrogen atom or a C3 -C10 alkenyl group, at least
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