prov:value
| - R8 is a hydrogen atom, a halogen atom, a C1-C8-alkyl group, which may be halogenated, a C6-C20-aryl group, which may be halogenated, a C6-C20-aryloxy group, a C2-C12-alkenyl group, a C7-C40-arylalkyl group, a C7-C40-alkylaryl group, a C8-C40-arylalkenyl group, a ???SiR9 3, ???NR9 2, ???Si(OR9)3, ???Si(SR9)3 or ???PR9 2, R4 are identical or different and each are a hydrogen atom, a C1-C10-alkyl gro
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