preferred_name: L-histidine + 3 S-adenosyl-L-methionine => hercynine + 3 S-adenosyl-L-homocysteine + 3 H(+)
preferred_name_lc: l-histidine + 3 s-adenosyl-l-methionine => hercynine + 3 s-adenosyl-l-homocysteine + 3 h(+)
label: L-histidine + 3 S-adenosyl-L-methionine => hercynine + 3 S-adenosyl-L-homocysteine + 3 H(+)
label_lc: l-histidine + 3 s-adenosyl-l-methionine => hercynine + 3 s-adenosyl-l-homocysteine + 3 h(+)