| http://www.w3.org/ns/prov#value | - R1, R2, R3 and R4 in formula I are each hydrogen, halogen, eg. fluorine, chlorine, bromine or iodine, nitro, cyano, alkyl of 1 to 12, preferably 1 to 9, in particular 1 to 4, carbon atoms, eg. methyl, ethyl, n-propyl, isopropyl, n-butyl, i-butyl, sec.-butyl or tert.-butyl, haloalkyl of 1 to 4 carbon atoms, eg. chloromethyl, fluoromethyl, difluoromethyl, trichloromethyl, trifluoromethyl, pentafluor
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