(CH3)4N CI (CH3 CH2 CH2 CH2)4N Br U Tetramethylammonium chloride Tetrabutylammonium bromide 四甲基氯化铵 四丁基溴化铵 (氯化四甲基铵) CH Ch cochochonch2 br CH Acetylcholine bromide 溴化乙酰胆碱Organic Chemistry Organic Chemistry Xiamen Xiamen University University (C H 3 ) 4 N+ Cl - (C H 3CH 2CH 2CH 2 ) 4 N+ Br - T etramethylam m o nium chlorid e Tetrabutylam m onium b r o mid e CH 3CO 2CH 2CH 2NCH 3 Br CH 3 CH 3 A cetylcholine b r o mid e (氯化四甲基铵 ) 四甲基氯化铵 四丁基溴化铵 溴化乙酰胆碱