mycinamicin III + S-adenosyl-L-methionine <=> mycinamicin IV + S-adenosyl-L-homocysteine + H(+)
mycinamicin iii + s-adenosyl-l-methionine <=> mycinamicin iv + s-adenosyl-l-homocysteine + h(+)
mycinamicin III + S-adenosyl-L-methionine <=> mycinamicin IV + S-adenosyl-L-homocysteine + H(+)
mycinamicin iii + s-adenosyl-l-methionine <=> mycinamicin iv + s-adenosyl-l-homocysteine + h(+)