PPO-IN-11 (Compound 10bh) is an inhibitor for protoporphyrinogen IX oxidase ( PPO ), that inhibits nicotiana tabacum PPO ( NtPPO ) with K i of 0.0603 μM. PPO-IN-11 exhibits herbicidal activities against dicot weeds Leaf mustard , Chickweed , Chenopodium serotinum and monocot weeds Alopecurus aequalis , Poa annua , and Polypogon fugax with a dose of 150 g a.i./ha.