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Preparation of disubstituted ureas.      Xia, Chungu; Xiao, Linfei; Chen, Jing.  (Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Peop. Rep. China).    Faming Zhuanli Shenqing Gongkai Shuomingshu  (2007),     6pp.  CODEN: CNXXEV  CN  1966491  A  20070523  Patent  written in Chinese.    Application: CN  2005-10125521  20051117.  Priority: .  CAN 147:52714    AN 2007:569531    CAPLUS
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