| http://www.w3.org/ns/prov#value | - The preferred compounds that may be obtained by the process of the present invention of those of formula I wherein X is as defined hereinabove, more particularly 3-chloro, R' represents a methyl or ethyl group and the O--CH2 --COOR' group is, with respect to the Q substituent, in meta position when Q is hydrogen and in para position when W and Q, together, form an ethylene group.
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