| http://www.w3.org/ns/prov#value | - In R3 and R4 alkyl represents 1 to 15, preferably 1 to 6, carbon atoms and aryl represents phenyl which can also contain one to three substituents on the ring, such as halogen, for example fluorine, chlorine or bromine, NO2, NR6 R7, OR8 and/or alkyl.
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