| http://www.w3.org/ns/prov#value | - A composition of matter comprising:a compound having the formula: ##STR32## or any pharmaceutically acceptable salt thereof, in which: X is a hydrogen or halogen atom; R1 is a hydrogen atom or an alkyl group containing from 1 to 3 carbon atoms; R2 is selected from the group consisting of,a hydrogen atom, and a substituted alkoxy group in which the substituent of the alkoxy group is selected from a
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