prov:value
| - Lower alkyl is, for example, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, neopentyl, n-hexyl or n-heptyl, preferably ethyl and especially methyl, while straight-chain C.sub.1 -C.sub.4 alkyl is n-propyl, n-butyl and
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