PPO-IN-11 (Compound 10bh) is an inhibitor of protoporphyrinogen IX oxidase (PPO) and specifically inhibits tobacco PPO (NtPPO) with a Ki of 0.0603 μM. It exhibits herbicidal activity against dicotyledonous weeds such as Leaf mustard, Chickweed, and Chenopodium serotinum, as well as monocotyledonous weeds like Alopecurus aequalis, Poa annua, and Polypogon fugax at a dosage of 150 g a.i./ha.