| http://www.w3.org/ns/prov#value | - a beta-monoaminoheterocycloethoxy group, or pharmaceutically acceptable salts thereof; R3 is a hydrogen atom or an alkyl group containing from 1 to about 3 carbon atoms; and R4 is a hydrogen atom, a hydroxyl group, or an alkoxy group in which the alkyl substituent contains from 1 to about 3 carbon atoms. 10.
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