Chlorimuron ethyl 25% WP refers to a wettable powder herbicide containing chlorimuron ethyl as its active ingredient, with a concentration of 25%. This herbicide is used in crops like soybean and paddy to selectively control post-emergence broadleaf weeds and sedges by inhibiting the ALS enzyme. The term "bis" is likely a manufacturer-specific designation or a part of the product's commercial name, such as "Qurin Chlorimuron Ethyl 25% WP"