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Morfamquat is a selective herbicide in that dicots but not monocots are affected at the normal field rates (19). The mechanism of this difference is not clearly understood but probably relates to the ability of morfamquat to be enzymatically converted to paraquat by esterases that cleave the bulky side groups on the molecule. Once in the cell, morfamquat then behaves identically to paraquat.

ChEBI: Morfamquat is an organic molecular entity.