preferred_name: L-methionyl-[protein] + S-adenosyl-L-methionine <=> S-methyl-L-methionyl-[protein] + S-adenosyl-L-homocysteine
preferred_name_lc: l-methionyl-[protein] + s-adenosyl-l-methionine <=> s-methyl-l-methionyl-[protein] + s-adenosyl-l-homocysteine
label: L-methionyl-[protein] + S-adenosyl-L-methionine <=> S-methyl-L-methionyl-[protein] + S-adenosyl-L-homocysteine
label_lc: l-methionyl-[protein] + s-adenosyl-l-methionine <=> s-methyl-l-methionyl-[protein] + s-adenosyl-l-homocysteine