| http://www.w3.org/ns/prov#value | - According to another example (b) of an alkylation process, a compound of general formula (I) in which R1 represents a hydrogen atom may be prepared by alkylation of an amine of general formula (IV) as previously defined except that R15 is a hydrogen atom or a group convertible thereto under the reaction conditions, with a compound of general formula (VI):
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