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== Pranala luar ==
* [http://www.sigmaaldrich.com/catalog/search/ProductDetail/SIAL/274984 Sigma Aldrich chemical profile] {{Webarchive|url=https://web.archive.org/web/20071016210219/http://www.sigmaaldrich.com/catalog/search/ProductDetail/SIAL/274984 |date=2007-10-16 }}
 
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