可能有四种:
CH2=C(CH3)-CH(CH3)-C(CH3)3
CH3-C(CH3)=C(CH3)-C(CH3)3
CH3-CH(CH3)-C=CH2
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C(CH3)3
CH2=C(CH3)-C=CH2
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C(CH3)3
CH2=C(CH3)-CH(CH3)-C(CH3)3
CH3-C(CH3)=C(CH3)-C(CH3)3
可以带环吗?