Cyclobutane exists predominantly in a "butterfly" conformation . 环丁烷主要成“蝶式”构象存在。
2.
cyclobutane exists predominantly in a "butterfly" conformation, in which the dihedral angle between the two wings is about 20°。 环丁烷主要成“蝶式”构象存在，其中两翼间的二面角大约为20。
3.
Uv radiation induced two major classes of pyrimidine dimmers : the pyrimidine ( 6 - 4 ) pyrimidone photoproduct ( 6 - 4 product ) and the cyclobutane pyrimidine dimmer ( cpd ) 紫外光照射可导致生物体产生两种损伤： ( 6 - 4 )光产物和环丁烷嘧啶二聚体。
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