In the intricate world of chemical sourcing, clear and unambiguous identification of substances is paramount. This is where the Chemical Abstracts Service (CAS) Registry Number, commonly known as the CAS number, plays a critical role. Each unique chemical substance is assigned a CAS number, a distinctive numerical identifier that serves as a universal language for chemists and researchers worldwide. Understanding the significance of CAS numbers is essential when procuring materials, especially for critical applications like pharmaceutical development.

A CAS number is a sequence of digits separated by hyphens, with no other signifying information. For instance, a CAS number might look like '123-45-6'. It is assigned by the CAS, a division of the American Chemical Society, to specific chemical substances based on their structure. This system ensures that regardless of synonyms, trade names, or regional variations in nomenclature, a chemical can be precisely identified. This is particularly important for pharmaceutical intermediates, where variations in structure can drastically alter properties and intended uses.

When sourcing materials such as TAD-194, a high-purity pharmaceutical intermediate, confirming its CAS number is a key step in verifying its identity and quality. Although the CAS number for TAD-194 is listed as 'N/M' (Not Mentioned) in the provided documentation, this highlights the importance of other identifying factors like the product name, grade, purity, and certifications. In cases where a CAS number is not readily available or applicable, as might be the case for novel intermediates or proprietary blends, other rigorous identification methods and supplier validation become even more critical.

The benefit of a CAS number lies in its ability to prevent confusion and streamline communication. It is used in regulatory submissions, safety data sheets (SDS), and scientific literature, ensuring that all parties are referring to the exact same chemical entity. For companies engaged in the supply chain of pharmaceutical ingredients, maintaining accurate records tied to CAS numbers is fundamental for compliance and operational efficiency. While TAD-194 may not have a CAS number listed here, its detailed specifications and quality certifications provide the necessary assurance for its intended applications.