| http://www.w3.org/ns/prov#value | - i) R1 is fluorine or hydrogen; [1619] iii) R3 and R3??? are independently hydrogen or fluorine; R4 is hydrogen; and [1620] 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. [1621] In another embodiment of the present invention, the active compound is of formula (I
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