label: Mg-protoporphyrin IX 13-monomethyl ester + S-adenosyl-L-homocysteine => Mg-protoporphyrin IX + S-adenosyl-L-methionine
label_lc: mg-protoporphyrin ix 13-monomethyl ester + s-adenosyl-l-homocysteine => mg-protoporphyrin ix + s-adenosyl-l-methionine