LI Xue-Qiang, WANG Hong, TU Yong-Qiang, WANG Shao-Hua
2004, Vol. 62(8): 839-841
1. Department of Chemistry and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000;
2. Department of Chemistry, Ningxia University, Yinchuan 750021
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