| http://www.w3.org/ns/prov#value | - radical or heterocyclyloxy radical which is unsubstituted or substituted or R is a hydrogen atom, halogen or a radical C(O)R3, OC(O)R3, S(O)nR3, OS(O)nR3, OH, CN, NO2, NH2, SF5, NR4R5 or Si(R6)3, where n is 0, 1 or 2; R1 independently at each occurrence is halogen, OH, SH, a carbon-free, nitrogen-containing radical or a carbon-containing radical having 1 to 30 carbon atoms, preferably 1 to 20 car
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