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The [[Chemical Abstracts Service]] (CAS), a division of the American Chemical Society, assigns unique identifiers to every different chemical. Most molecule databases today permit searching for a compound by entering its CAS number.  There are over 30 million CAS numbers as of May 2007.
 
The [[Chemical Abstracts Service]] (CAS), a division of the American Chemical Society, assigns unique identifiers to every different chemical. Most molecule databases today permit searching for a compound by entering its CAS number.  There are over 30 million CAS numbers as of May 2007.
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[[Category:Chemistry]]
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