| http://www.w3.org/ns/prov#value | - In formulae (IA) and (IB), R1, R2, R3 and R4 preferably, or in particular, have those meanings which have already been mentioned above in connection with the description of the compounds of the formula (I) according to the invention as being preferred, or particularly preferred, for R1, R2, R3 and R4.
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