prov:value
| - in which R1 is an aliphatically unsaturated monovalent hydrocarbon group such as vinyl and allyl, preferably vinyl, groups; R2 is a monovalent hydrocarbon group free from aliphatic unsaturation such as alkyl groups, e.g., methyl, ethyl, propyl and butyl, aryl groups, e.g., phenyl and tolyl groups, and cycloalkyl, e.g., cyclohexyl, as well as those substituted monovalent hydrocarbon groups obtained
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