prov:value
| - (b) where R5 is hydrogen and all of R3, R4, R6 and R7 are other than hydrogen, then all of R3, R4, R6 and R7 must be either chlorine or methyl, and (c) where R3 and R7 are both hydrogens, then at least one of R3, R4, R5 and R6 must be hydrogen, and agriculturally acceptable salts thereof.
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