CAS No: 208465-21-8 Mode of action: As a systemic sulfonylureas herbicide, and a ALS inhibitor. Uses: Used as a post-emergence herbicide, it has good control for annual grass weeds and some broadleaf weed like chickweed in winter and spring wheat. Formulation types: Mesosulfuron-methyl 95% TC, Mesosulfuron-methyl 30g/L OD.