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CAS Registry is the world's largest database of chemical substances, including:

• 17 million substance records for chemicals reported in patents and chemical literature since 1957;

• the largest collection of organic substances—more than 12 million, drawn from both journal articles and patents;

• more than 19 million chemical and commercial substance names;

• CAS Registry Numbers®, the international standard for concise and reliable substance identification.

Use CAS Registry for authoritative substance information. Call 1-800-753-4227

or 614-447-3700. Or visit our Web site at http://www.cas.org.

CAS Registry is available through SciFinder \ STINT, or STN Easy '.

CDS A division of the American

Chemical Society.

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