PPO-IN-17 (Compound 6R) is the inhibitor protoporphyrinogen IX oxidase (PPO) that inhibits Nicotiana tobacco PPO (NtPPO) with Ki of 30.34 nM. PPO-IN-17 exhibits herbicidal activity that inhibits barnyardgrass (E. crus-galli), foxtail grass (D. sanguinalis), alfalfa (M. sativa) and Canada cocklebur (C. canadensis) (>95% inhibition rate at a concentration of 37.5 g/hm2) . PPO-IN-17 exhibits no toxicity on rice (at a concentration of 75 g/hm2) or on honeybees (at a concentration of 6400 mg/kg) [1].
