| http://www.w3.org/ns/prov#value | - R is a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms, such as the methyl or ethyl radical in particular, or RO is an oxyethylenated chain of the formula ##STR2## in which R4 and R5 independently are a hydrogen atom or a methyl radical and n is an integer greater than or equal to 1;
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