prov:value
| - For all of the formulas described above, the lower alkyl groups are the same or different and are independently selected from those lower alkyl groups having one to six carbon atoms, such as for example methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopropyl, cyclobutyl, cyclohexyl, cyclopropylmethyl or cyclobutylmethyl groups.
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