Fenquinotrione, a 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor, exhibits IC50 values of 27.2 and 44.7 nM against HPPD from rice and Arabidopsis thaliana, respectively. As an herbicide, it effectively controls a wide spectrum of broadleaf and sedge weeds while demonstrating notable selectivity for rice [1].