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Examples of suitable demethylating agents include N iodosuccinamide NIS, ethyl chloroformates such as 1 chloroethyl chloroformate, dichloroethyl chloroformate, trichloroethyl chloroformate, О± Chloroethylchloroformate ACE Cl, vinyl chloroformate VO Cl, cynogen bromide BrCN von Braun s reaction, diethyl azodicarboxylate, pyridinium chloride, and the like liquid viagra drink
