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Catalog Names, CAS Numbers, and Peptide Identifiers

Why the same research compound shows up under three names — and which identifiers to trust when you order.

The naming problem in peptide catalogs

Research peptides accumulate nicknames. A sequence may appear under a developmental code, a USAN-like stem, an abbreviated research code, and a storefront slug. Epitalon and Epithalon are the same tetrapeptide idea under spelling variants; Melanotan listings may distinguish MT-I from MT-II; GLP research compounds often carry both a generic path name and a catalog code on our site.

For lab procurement, treat the storefront title as a convenience label. Confirm identity with sequence, CAS when published, molecular formula or weight on the spec table, and the COA for the lot you receive.

CAS registry numbers

A CAS number points at a specific chemical substance record. When a product page lists a CAS, use it to cross-check literature and inventory systems. Some research peptides and blends will not have a single tidy CAS — especially multi-component SKUs — so absence of CAS is not automatically a red flag, but it does mean you lean harder on sequence and COA identity.

Do not assume two vials with similar marketing names share a CAS. Blends (for example research combinations sold as a single SKU) are not interchangeable with the single-compound pages they reference.

Sequence and length

For peptides, the amino-acid sequence (and notes about salts, acetylation, or amidation) is often the decisive identifier. Spec tables on our product pages call out sequence or residue count when relevant. If your protocol cites a specific salt form, match that on the COA and label before the vial enters a study.

Truncated research fragments (common in older literature) can share a family name with a full-length molecule. Read the residue count. Ordering by vibe is how labs waste a week.

Storefront slugs and legacy URLs

Our URLs use stable slugs such as epitalon-epithalon or mt-1-melanotan-i so synonyms resolve to one product page. Older paths redirect when we consolidate names. If a bookmark 404s, search the catalog or start from the products index rather than guessing a hyphen pattern.

Educational articles in this section link back to FAQs, the COA Library, and RUO policy pages so naming guidance stays tied to how we actually sell and document materials.

Quick checklist before you add to cart

  • Match the protocol’s sequence or CAS to the product spec table
  • Confirm fill amount (mg) and form (lyophilized vs solution)
  • Note whether you need a single compound or a labeled blend SKU
  • Plan to file the lot COA when the order arrives
  • Keep RUO use limits in view — catalog clarity does not change lawful use