| http://www.w3.org/ns/prov#value | - In most of the preferred embodiments that are considered to be of greatest interest R2 and R4 are in fact each provided by a benzylamino group of formula II, and preferably at least one of R6 and R7 will be alkoxy, especially methoxy, which will most preferably be substituted in the 4-position but which can alternatively or additionally (in disubstituted derivatives) be substituted in the 3-positi
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