| http://www.w3.org/ns/prov#value | - Hereinafter, preferred definitions of other substituents according to the invention are given: R 4 is preferably H, C ^ alkyl, C 3-6 cycloalkyl, and C 3 6 cycloalkyl-methyl, especially H, methyl, ethyl, propyl, i-propyl, n. -propyl, Cylcopropyl, cyclopentyl, cyclohexyl, cyclopropylmethyl, cyclopentylmethyl, Cyclohexymethyl.
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