prov:value
| - R4 and R5, which are identical or different, represent a hydrogen atom or an alkyl radical containing from 1 to 4 carbon atoms, R6 is an hydrogen atom, alkyl, aryl, alkylaryl or arylalkyl radical containing from 1 to 30, preferably from 1 to 8 carbon atoms, n is for example between 2 and 100, preferably between 6 and 100, m is for example between 0 and 50.
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