In the complex and highly regulated world of chemical procurement, especially within the pharmaceutical sector, precise identification of compounds is paramount. The Chemical Abstracts Service (CAS) Registry Number, commonly known as a CAS number, serves as a unique identifier for chemical substances. For procurement professionals and R&D scientists sourcing pharmaceutical intermediates, understanding the significance and effective utilization of CAS numbers is indispensable.

What is a CAS Number?

A CAS number is a unique numerical identifier assigned by the Chemical Abstracts Service, a division of the American Chemical Society, to every chemical substance described in the open scientific literature. It consists of three parts separated by hyphens, with the first part ranging from 1 to 7 digits, the second part from 2 to 3 digits, and the third part being a single check digit. For example, Ethyl 2-ethoxy-1-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)methyl)-1H-benzo[d]imidazole-7-carboxylate is identified by CAS number 1397836-41-7.

Why are CAS Numbers Crucial for Pharmaceutical Intermediates?

The importance of CAS numbers in the pharmaceutical supply chain cannot be overstated:

• Unambiguous Identification: Chemical nomenclature can sometimes be complex and have multiple synonyms. A CAS number provides a single, universally recognized identifier, eliminating ambiguity and ensuring that all parties are referring to the exact same chemical substance. This is critical when ordering intermediates like Azilsartan precursors.
• Facilitating Accurate Sourcing: When searching for a specific pharmaceutical intermediate, using its CAS number is the most reliable method to find accurate product listings from manufacturers and suppliers. It streamlines the search process on B2B platforms, in chemical databases, and when requesting quotes.
• Regulatory Compliance: Regulatory bodies often use CAS numbers to track chemicals for safety, environmental, and trade purposes. Accurate identification via CAS number is essential for compliance documentation and international trade.
• Quality Control and Verification: When receiving shipments, verifying the CAS number on the product label against the purchase order ensures that the correct material has been supplied, preventing potentially critical errors in manufacturing.
• Safety Data Sheets (SDS): SDS documents, which provide vital safety and handling information, are almost always indexed by CAS number, making them easily accessible for specific compounds.

Best Practices for Using CAS Numbers in Procurement

For buyers in the pharmaceutical industry, integrating CAS numbers into your sourcing strategy is a best practice:

• Always Include the CAS Number: When requesting quotes or placing orders for intermediates, always specify the CAS number along with the chemical name. For example, when looking to buy Ethyl 2-ethoxy-1-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)methyl)-1H-benzo[d]imidazole-7-carboxylate, clearly state 'CAS: 1397836-41-7'.
• Cross-Reference Information: If a supplier provides a CAS number, cross-reference it with reliable chemical databases to confirm its accuracy and the associated compound structure.
• Use for Database Searches: Leverage CAS numbers when searching supplier catalogs or databases to quickly narrow down results and identify potential manufacturers.

In summary, CAS numbers are more than just digits; they are the backbone of unambiguous chemical communication. For anyone involved in sourcing pharmaceutical intermediates, accurately identifying and using the correct CAS number is fundamental to ensuring quality, safety, and efficiency in procurement operations, from R&D through to commercial manufacturing.