preferred_name: protoporphyrinogen IX + 3 a quinone <=> protoporphyrin IX + 3 a quinol
preferred_name_lc: protoporphyrinogen ix + 3 a quinone <=> protoporphyrin ix + 3 a quinol
label: protoporphyrinogen IX + 3 a quinone <=> protoporphyrin IX + 3 a quinol
label_lc: protoporphyrinogen ix + 3 a quinone <=> protoporphyrin ix + 3 a quinol