preferred_name: protoporphyrin IX + Fe++ => heme + 2 H+ (Gallus gallus)
preferred_name_lc: protoporphyrin ix + fe++ => heme + 2 h+ (gallus gallus)
label: protoporphyrin IX + Fe++ => heme + 2 H+ (Gallus gallus)
label_lc: protoporphyrin ix + fe++ => heme + 2 h+ (gallus gallus)