| http://www.w3.org/ns/prov#value | - ntaining heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; and R??? is a C1-C20-alkylidene, C6-C20-arylidene, C7-C20-alkylarylidene, or C7-C20-arylalkylidene radical; preferably X is a hydrogen atom, a halogen atom, a OR???O or R group; more preferably X is chlorine or a methyl radical; R1, R2, R5, R6, R7, R8 and R9, equal to or different from each other, are hydrogen at
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