erythromycin D + S-adenosyl-L-methionine = erythromycin B + S-adenosyl-L-homocysteine + H(+)
erythromycin d + s-adenosyl-l-methionine = erythromycin b + s-adenosyl-l-homocysteine + h(+)
erythromycin D + S-adenosyl-L-methionine = erythromycin B + S-adenosyl-L-homocysteine + H(+)
erythromycin d + s-adenosyl-l-methionine = erythromycin b + s-adenosyl-l-homocysteine + h(+)