[Chemical name] sodium chlorate [Chemical formula] NaClO3 [Common or alternative name] — [Source and description] 
Available from gardening and agricultural stores. This herbicide is toxic to all green plants and, as such, is becoming less available as more selective herbicides some onto the market. Some brand names are Atlacide, Defol, Drop-Leaf, and Tumbleaf. Read product labeling to deduce the particular purity of any of these brands.