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The title compound, C16H19N7, is a potent new herbicide. X-ray analysis reveals that the piperazine ring adopts a chair conformation and weak C—H...N hydrogen bonds link the mol­ecules into a chain along the a axis.

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The title compound, C18H20ClN3O2, is a potent new herbicide. X-ray analysis reveals that the benzene ring is twisted away from the isoxazole ring by 67.7 (1)°. The crystal packing is stabilized by inter­molecular N—H...N and C—H...O hydrogen bonds.
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