prov:value
| - The radicals R* can be, independently of one another, C1-C10-alkyl, preferably C1-C7-alkyl, e.g. methyl, ethyl or i-propyl, C3-C10-cycloalkyl, preferably C3-C7-cycloalkyl, e.g. cyclopropyl or cyclohexyl, C6-C10-aryl, preferably phenyl, or alkylaryl having from 1 to 4 carbon atoms in the alkyl part and from 6 to 10 carbon atoms in the aryl part, for example benzyl.
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