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; Z -CA-X -Y improper torsion. CA is any ring carbon (CA,CB,CN,CV,CW,CR,CK,CQ,CS,C*)
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ÁíÍâcaseB    C1 C2 C3 C4 ×é³ÉÒ»¸öimproper ÊÇÏßÐÔµÄ
ÁíÍâcaseC    C1 C2 C3 H4 Ò²×é³ÉÒ»¸öimproper ÊÇÏßÐÔµÄ

ÎÒµÄÏë·¨ÄØ  caseBµÄimproperÊÇ0¶È£¬caseCµÄimproperÊÇ180¶È
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