| http://www.w3.org/ns/prov#value | - i) R4 is hydrogen; ii) R1 is fluorine or hydrogen; iii) R3 and R3??? are independently hydrogen or fluorine; and iv) R2 is a cyclohexyl optionally substituted with alkyl, halo, alkenyl, alkynyl, cycloalkyl, aminoalkyl, hydroxyalkyl, haloalkyl, thioalkyl, aryl, or heteroaryl in the 2 or 3-position.
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