Method Treatment of 8,9 anhydroerythromycin 6,9 hemiketal with iodine in the alkaline solution provided corresponding N monodemethylated 12 membered ring erythromycin derivative.

方法8,9脱水红霉6,9半缩在碱性溶剂中反应得到相应的N去甲基十二元环红霉衍。