prov:value
| - The alkyl groups represented by R13 in the formula [25] and the alkyl groups in the haloalkyl groups also represented by R13 may be straight or branched and preferably have 1 to 6 carbon atoms, examples thereof including methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, n-pentyl, isopentyl, tert-pentyl, 1-methylpentyl, n-hexyl and isohexyl.
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