| http://www.w3.org/ns/prov#value | - The invention relates more especially to compounds of formulae I and Ia and their salts, in which the index n is 0, alk is --CH(R)-- and R is hydrogen, Ar is phenyl that is unsubstituted or is substituted by trifluoromethyl or by halogen having an atomic number of up to and including 35, such as fluorine, especially in the 3- or 4-position, or Ar is unsubstituted thienyl, such as 2-thienyl, and th
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