| http://www.w3.org/ns/prov#value | - either with a thiourea (ROUTE B) of formula: ##STR8## in which R5 and Z are as defined for (I), to obtain a compound of formula (IV) ##STR9## in which R1, R2, R3, R4, n, R5 and Z are as defined for (I), in order to subsequently subject it to an alkylation reaction in order to provide the compound (I) and to obtain, in particular in the case where Z represents a nitrogenous heterocycle, such as ind
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