prov:value
| - consisting of hydrogen, halo, lower alkyl, aryl, lower alkoxy, and lower halogenated alkyl; R9, R10, R11, and R12, which may be same or different, are independently selected from the group consisting of hydrogen, halo, lower alkyl, lower alkoxy, and lower halogenated alkyl; R13, which may be same or different in each of the groups R1, R2, R3, R4, R5, and R6 is an alkyl group, straight chain or br
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