| http://www.w3.org/ns/prov#value | - In the above formulae, Ra, Rb, Rc and Rd are each, independently of one another, nonacidic hydrogen, C1-C30-alkyl and aryl-, heteroaryl-, cycloalkyl-, halogen-, hydroxy-, amino-, carboxy-, formyl-, ???O???, ???CO???, ???CO???O??? or ???CO???N<substituted derivatives thereof, for example methyl, ethyl, 1-propyl, 2-propyl, 1-butyl, 2-butyl, 2-methyl-1-propyl (isobutyl), 2-methyl-2-propyl (tert-butyl
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