C2H5 CH (CH3)CH-CH2-N-CH3 CH3NH-C--CH2CH2CH N甲基N-乙基异丁胺 CH 2-甲基2(N-甲氨基)烷 CH CH CH2N一CH3Cl CH2 -N-CHs Oh CH CH 氯化四甲铵 氢氧化三甲乙铵(CH3)2CH－CH2－N－CH3 C2H5 N-甲基-N-乙基异丁胺 C CH3 CH3NH CH3 CH2CH2CH3 2-甲基-2-(N-甲氨基)戊烷 N+ CH3 CH3 CH3 C2H5 OH- 氢氧化三甲乙铵 N+ CH3 CH3 CH3 CH3 Cl- 氯化四甲铵