Brassicanate A sulfoxide, isolated from Brassica oleracea [1], exhibits herbicidal properties by inhibiting the biosynthesis of essential amino acids in plants. It operates by binding to key enzymes such as dihydroxyacid dehydratase (DHAD), hydroxymethylpyruvate dioxygenase (HPPD), acetolactate synthase (ALS), PYL family proteins, and transport inhibitor response 1 (TIR1), thereby reducing their enzymatic activity.