Butachlor
Butachlor is a herbicide of the acetanilide class. It is used as a selective pre-emergent herbicide to control annual grasses and some broad-leaved weeds. It was introduced circa 1970. It is extensively used in India in the form of granules and emulsifiable concentrate in rice as post emergence herbicide, and was sold in India in 2005-06, declining to in 2009-10.
Butachlor's herbicide mode of action is to prevent formation of very long chain fatty acids; this makes its HRAC classification group J, K3 and 15.