preferred_name: L-histidine + S-adenosyl-L-methionine => N(alpha)-methyl-L-histidine + S-adenosyl-L-homocysteine + H(+)
preferred_name_lc: l-histidine + s-adenosyl-l-methionine => n(alpha)-methyl-l-histidine + s-adenosyl-l-homocysteine + h(+)
label: L-histidine + S-adenosyl-L-methionine => N(alpha)-methyl-L-histidine + S-adenosyl-L-homocysteine + H(+)
label_lc: l-histidine + s-adenosyl-l-methionine => n(alpha)-methyl-l-histidine + s-adenosyl-l-homocysteine + h(+)