| http://www.w3.org/ns/prov#value | - In the formula just given, R represents an optionally substituted hydrocarbyl group, e.g., an alkyl, aryl, alkenyl, alkaryl and aralkyl group, preferably having up to 20, particularly up to 10 carbon atoms, such as, e.g., methyl, ethyl, propyl, butyl, vinyl, allyl, phenyl, benzyl, tolyl and naphthyl.
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