In the vast and complex world of chemistry, precise identification of substances is not just a matter of convenience but a fundamental requirement for safety, regulation, and commerce. The Chemical Abstracts Service (CAS) Registry Number, or CAS number, is a unique numerical identifier assigned to every chemical substance described in the scientific literature. For professionals in research, manufacturing, and supply, understanding and correctly utilizing CAS numbers is critical, especially when sourcing specific compounds like D-2-Amino-4-methylpentanoic acid (CAS 328-38-1).

The CAS number serves as a universal language for chemical substances, eliminating ambiguity and potential confusion that can arise from multiple names or synonyms for the same compound. For instance, D-2-Amino-4-methylpentanoic acid is also widely known as D-Leucine. Without its CAS number, 328-38-1, a researcher or procurement specialist might unknowingly select the wrong stereoisomer or a similarly named compound, leading to failed experiments or compromised product quality.

When engaging in chemical sourcing, the CAS number is often the primary search parameter. It allows buyers to quickly and accurately locate desired products from manufacturers and suppliers worldwide. For a compound like D-2-Amino-4-methylpentanoic acid, which has specific applications in biochemical research, pharmaceutical intermediates, and fine chemical synthesis, ensuring the correct CAS number is vital. This accuracy prevents costly errors and ensures that the material procured meets the exact specifications required for its intended use.

Furthermore, CAS numbers are essential for regulatory compliance and safety data management. Safety Data Sheets (SDS) and hazard information are universally linked to these numbers, providing critical guidance on handling, storage, and emergency procedures. A reliable supplier will always provide the correct CAS number along with comprehensive safety information for products such as D-Leucine.

In essence, the CAS number is more than just a code; it's a cornerstone of chemical information management. It facilitates clear communication, ensures product integrity, and underpins the safety protocols necessary for working with chemical substances. For anyone involved in the chemical supply chain, from a research lab ordering small quantities to a large manufacturing plant sourcing bulk materials, mastering the use of CAS numbers is an indispensable skill.