Pyraclonil is a chemical compound that acts as a protoporphyrinogen oxidase (PPO) inhibitor. It functions as a herbicide and demonstrates high effectiveness in controlling both susceptible and multiple-herbicide-resistant populations of *E. indica*. Additionally, Pyraclonil is noted for its role as a click chemistry reagent, containing an Alkyne group which allows it to undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) reactions with molecules possessing Azide groups.
- Mechanism of action: PPO inhibitor.
- Application: herbicide, effective against susceptible and multiple-herbicide-resistant *E. indica*.
- Chemical reactivity: click chemistry reagent with an alkyne group, capable of CuAAc reactions with azide-containing molecules.
- In vitro efficacy: shows good control in vitro, leading to 94.5-94.9% and 89.5-90.4% fresh-weight reductions in susceptible and resistant populations, respectively.