Wiktionary
flufenacet
n. The herbicide ''4′-fluoro-N-isopropyl-2-[5-(trifluoromethyl)-1,3,4-thiadiazol-2-yloxy]acetanilide''
Wikipedia
Flufenacet
Flufenacet is an oxyacetanilide herbicide applied before crops have emerged.
In the model plant Arabidopsis thaliana it causes similar symptoms to the fiddlehead mutant.