| http://www.w3.org/ns/prov#value | - Where R1, R2 and/or R3 in formula I represent carbocyclic radicals, these are preferably cycloalkyl, aralkyl or aryl radicals preferably having from 5 to 12 carbon atoms which may be substituted for example with halogen, nitro, cyano, alkyl, alkoxy, alkylthio and alkyloxy carbonyl, the alkyl portions in the last mentioned substituents having preferably 1 to 4 carbon atoms; examples of such unsubst
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