| http://www.w3.org/ns/prov#value | - The compounds of this invention may be conveniently represented by the formula I wherein R is a hydrogen atom or halo having an atomic weight of from about 19 to 80, i.e., fluoro, chloro or bromo. lower alkyl, lower alkoxy, lower alkylthio, or difluoromethoxy; R is lower alkyl, e.g., having from one to three carbon atoms, such as methyl, ethyl, n-propyl and isopropyl; and A is either of the struct
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