preferred_name: protoporphyrinogen IX + 3 A <=> protoporphyrin IX + 3 AH2
preferred_name_lc: protoporphyrinogen ix + 3 a <=> protoporphyrin ix + 3 ah2
label: protoporphyrinogen IX + 3 A <=> protoporphyrin IX + 3 AH2
label_lc: protoporphyrinogen ix + 3 a <=> protoporphyrin ix + 3 ah2