CH3=cH2H-CHcH2-CH2-ch3CH3-C—CH一CH3 CH2 CH3 CH3 CH 4一甲基一3一乙基庚烷 3一甲基-2一丁酮 CH CH CH—CH CH3 CH CH CH 35-二甲基-3一庚烯12 CH3 CH2 CH CH2 CH CH3 CH3 CH2 CH2 CH3 1 2 3 4 5 6 7 CH3 CH3 CH3 C CH O 1 2 3 4 CH3 CH2 CH3 CH CH3 CH2 CH3 C 2 6 5 4 3 1 7 CH 4－甲基－3－乙基庚烷 3－甲基－2－丁酮 3,5－二甲基－3－庚烯