| http://www.w3.org/ns/prov#value | - Compounds of formula (I) wherein R3 represents CH???C(CN)2, said compounds being represented by formula (I-h???), can be prepared by reacting an intermediate of formula (XI-b) with propanedinitrile in the presence of a suitable base, such as for example piperidine, and a suitable solvent, such as for example an alcohol, e.g. ethanol and the like.
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