| http://www.w3.org/ns/prov#value | - The invention relates 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 lower alkyl, especially having up to and including 4 carbon atoms, such as methyl, Ar is phenyl, thiazolyl, such as 2-thiazolyl, or pyridyl, such as 2-pyridyl, each of which is unsubstituted or is substituted by lower alkoxy, especially having up to and including
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