Abstract: A compound selected from those of formula (I): wherein m and n, which may be identical or different, each represent an integer from 0 to 2 inclusive, with the sum of the two integers being from 2 to 3 inclusive, p and q, which may be identical or different, each represent an integer from 0 to 2 inclusive, Alk represents an alkylene, alkenylene or alkynylene chain, X represents an oxygen atom, a sulphur atom or an —N(R)— group wherein R represents a hydrogen atom or an alkyl group, Y, Y? and W are as defined in the description, its enantiomers, diastereoisomers, and addition salts thereof with one or more pharmaceutically acceptable acid or base. Medicinal products containing the same which are useful for treating conditions associated with central histaminergic systems.