C1: complex I NADH Oxido-reductase

C2: complex II: succinate-dehydrogenase

C3: complex III cytochrome bc1 (ubiquinol oxidase) at Qo site (cyt b gene)

C4: complex III cytochrome bc1 (ubiquinone reductase) at Qi site QiI fungicides

C5: uncouplers of oxidative Phosphorylation

C7: ATP transport

C8: inhibition of complex III