| prov:value
| - In formulas (I) to (VII) the residues R1 to R5 can indicate, in each instance independently of one another: hydrogen, a lower alkyl group with 1 to 10 carbon atoms, in particular 1 to 4 carbon atoms, such as the methyl, ethyl, n-propyl, i-propyl, and the i-butyl group as well as the various isomers thereof, a cycloalkyl group with 3 to 6 carbon atoms, such as in particular the cyclopropyl, cyclobu
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