| http://www.w3.org/ns/prov#value | - In the formula, R2 is a hydrogen atom or a methyl group and R3 is an alkyl group or an alkoxy-substituted alkyl group having 1 to 18 carbon atoms exemplified by methyl, ethyl, propyl, butyl, octyl, 2-methoxyethyl and 2-butoxyethyl groups.
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