prov:value
| - X, equal to or different from each other, is a hydrogen atom, a halogen atom, an R, OR, OSO2CF3, OCOR, SR, NR2 or PR2 group, wherein R is a linear or branched, C1-C20-alkyl, C3-C20-cycloalkyl, C6-C20-aryl, C7-C20-alkylaryl, or C7-C20-arylalkyl radical, optionally containing at least one heteroatom belonging to groups 13-17 of the Periodic Table of the Elements; two X can join to form a C4-C40dieny
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