| http://www.w3.org/ns/prov#value | - Further preference is given to the radicals R1 each being, independently of one another, optionally functionalized C3-C20-cycloalkyl, particularly preferably C3-C12-cycloalkyl, very particularly preferably C3-C6-cycloalkyl, for example cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl.
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