| http://www.w3.org/ns/prov#value | - This invention provides a biologically active agent, wherein the agent is a compound of the formula: wherein n is 1 or 2; t is 0 or 1; m is 0 and r is 1, or m is 1 and r is 0; A is phenyl, unsubstituted or substituted by 1 or 2 groups selected from: halo, alkyl having 1 or 2 carbon atoms, perfluoromethyl, alkoxy having 1 or 2 carbon atoms, and perfluoromethoxy; or cycloalkyl having from 3 to 6 rin
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