the most common structure

     Good morning.
 	Who can tell me how to pick up the most common structure from a set of
 compounds, and save it into a structure file? Could you indicate to me further
 softwares able to perform the same task? I have SYBYL software, but no DISTILL
       Thank you very much!
 Li Qiang
 Shanghai Institute of Organic Chemistry
 Chinese Academy of Sciences
 No.354 Road FengLin
 ShangHai, 200032, China
 Phone: 08621-64163300-2735
 Fax: 08621-64166128

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