| http://www.w3.org/ns/prov#value | - among fluorine, chlorine or bromine atoms, alkyl or alkoxy groups; X is a ##STR36## wherein R11 is a hydrogen atom, alkyl, acyl of a mineral acid selected among nitric, phosphoric and sulfuric acid or an acyl of alkylsulfonic or benzenesulfonic acid; R12 is a hydrogen atom, alkyl optionally substituted by from 1 to 3 substituents selected among fluorine, chlorine or bromine atoms, alkoxy or cyano;
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