3-(4,5-Dihydroisoxazol-3-yl)-2-methyl-4-(methylsulfonyl)benzoic Acid is a Topramezone (T542513) impurity. Topramezone (T542513) is a herbicide, which belongs to the class of pyrazolones or benzoylpyrazoles. It can be used to control broad leave weeds and grass weeds in maize crop protection.