| http://www.w3.org/ns/prov#value | - or a pharmaceutically acceptable derivative thereof, where X is an aryl or heteroaryl group; R and R1 are each independently alkyl, aryl, or heteroaryl groups having 1-20 carbon atoms, wherein at least one of R and R1 is substituted with at least one fluorine atom; and R2 is an alkyl group, optionally substituted with one or more fluorine atoms.
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