prov:value
| - M, L and R1 have the meaning reported above; R4, equal to or different from each other, is a hydrogen atom or a linear or branched, saturated or unsaturated C1-C20-alkyl, C3-C20-cycloalkyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radical, optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R5, R6, R7, R8 and R9, equal to or different from ea
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