Advantage Clethodim 240 herbicide contains Clethodim, the active ingredient in Centurion®. Advantage Clethodim 240 herbicide is a Group 1, systemic, and selective post-emergence herbicide, offering efficacy on both annual and perennial grassy weed species. (Note: Package contains 3 L of clethodim and 9 L of crop oil.) Contains Clethodim, the active ingredient in Centurion®.