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(+)