erythromycin A + S-adenosyl-L-homocysteine + H(+) => erythromycin C + S-adenosyl-L-methionine
erythromycin a + s-adenosyl-l-homocysteine + h(+) => erythromycin c + s-adenosyl-l-methionine
erythromycin A + S-adenosyl-L-homocysteine + H(+) => erythromycin C + S-adenosyl-L-methionine
erythromycin a + s-adenosyl-l-homocysteine + h(+) => erythromycin c + s-adenosyl-l-methionine