写出下列有机物的结构简式 2，6-二甲基-4-乙基辛烷你 2-甲基-1-戊烯

CH2=C-CH2-CH2-CH3
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CH3
CH3-CH-CH2-CH-CH2-CH-CH2-CH3
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CH3. CH2CH3. CH3

CH3CH(CH3)CH2CH(C2H5)CH2CH(CH3)CH2CH3
CH2=C(CH3)CH2CH2CH3