prov:value
| - R1, R2, R3, which can be the same or different, are hydrocarbyl substituents consisting of carbon and hydrogen atoms, preferably having 1 to 12 carbon atoms and usually being selected from the group consisting of alkyl, aryl, alkaryl, aralkyl, alkenyl radicals, alkyl radicals of 1-3 carbons, particularly methyl, being preferred.
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