prov:value
| - The alkyl groups represented by R16, R17 and R18 in the formula [27] may be straight, branched or cyclic and preferably have 1 to 8 carbon atoms, examples thereof including methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, n-pentyl, isopentyl, tert-pentyl, 1-methylpentyl, cyclopentyl, n-hexyl, isohexyl, cyclohexyl, heptyl and octyl.
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