CH3 CH3
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CH3--C--C--CH3 高度对称,无论你CL取代在哪里,都是同种啊,相互倒转一下就一样的.
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cH3 cH3 ③
CH3
① ② | ② ①
3-甲基戊烷 CH3-CH2-CH-CH2-CH3
④