CH3-CH2-CH-CH2-CH2-CH2-CH3 (3-甲基庚烷)
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CH3
CH3
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CH3- C - CH-CH2-CH2-CH3 (2,2-二甲基-3-乙基己烷)
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CH3 CH2CH3
CH3CH2 CH3
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CH3-CH2-CH-C-CH2-CH2-CH3 (4,4-二甲基-3-乙基庚烷)
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CH3