| http://www.w3.org/ns/prov#value | - In some embodiments of the second group of compounds of formula IA and IC, where Z1 is a CR4 group, Z2 is a CR5 group, and Z3 is a CR6 group, at least one of R4, R5, or R6 is a halogen such as Cl or F. In other such embodiments, at least one of R4, R5, or R6 is a F.
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