prov:value
| - The alkyl group represented by X includes a straight-chain or branched alkyl group of 1 to 6 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 1-ethylpropyl, 2-ethylpropyl, n-pentyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl or 2,2-dimethylpropyl, and a cycloalkyl group of 5 to 7 carbon atoms, such as cyclopentyl, cyclohexyl or cycloheptyl.
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