Fmoc-L-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH (CAS 2612237-97-3), commonly catalogued as Retatrutide intermediate, is supplied by Monuo Chemical for B2B peptide and research buyers. Buyers typically search by retatrutide linker, retatrutide side chain, Fmoc-Lys C20 side chain or CAS when sourcing a protected lipidated lysine building block for peptide process R&D.
Key Specifications at a Glance
| Product Name | Fmoc-L-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH (Retatrutide intermediate / retatrutide linker) |
|---|---|
| CAS Number | 2612237-97-3 |
| Molecular Formula | C60H94N4O13 |
| Molecular Weight | 1079.41 g/mol |
| Chemical Class | Fmoc-protected amino acid derivative; C20 lipidated lysine side-chain building block with single AEEA linker |
| Appearance | Typically white to off-white solid (confirm on COA) |
| Purity / Specification | 98% (confirm assay on the batch COA) |
| Typical Use Area | Peptide SPPS / process R&D; retatrutide- and tirzepatide-related side-chain assembly |
| Category | Oligo-peptide / Cosmetics Peptide |
| Documents | COA and SDS available on request |
| Supply Origin | China | Worldwide shipping |
What Is Fmoc-L-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH?
Fmoc-L-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH (CAS 2612237-97-3) is a protected lysine derivative bearing an Fmoc group on the α-amino function, a C20 fatty-acid side chain, a γ-glutamic acid tert-butyl ester unit and a single AEEA (aminoethoxyethoxyacetic acid) linker. Molecular formula C60H94N4O13; molecular weight about 1079.41 g/mol. Supplier databases also list it as Fmoc-L-Lys[C20-OtBu-γ-Glu(OtBu)-AEEA]-OH, retatrutide linker, retatrutide side chain, or tirzepatide-related impurity / side-chain nomenclature. Always match CAS 2612237-97-3 on the batch COA.
Peptide-chemistry literature and intermediate suppliers describe this compound as a key building block in solid-phase peptide synthesis (SPPS) routes toward lipidated incretin peptides, including retatrutide and certain tirzepatide-related sequences. The orthogonal tert-butyl and Fmoc protecting groups support controlled assembly of C20 lipid-modified peptide intermediates. It is a research and process-development peptide intermediate—not a finished drug substance and not positioned here as a topical cosmetic active. Monuo Chemical supplies this material as a B2B peptide raw material under Oligo-peptide / Cosmetics Peptide, with batch identity documentation (COA / SDS). Finished-product claims, labeling and local regulatory filings remain the customer’s responsibility. Confirm assay, protecting-group pattern and structure identity against the batch COA for your intended method.
Synonyms & Search Names
- Retatrutide intermediate
- Retatrutide linker / retatrutide side chain
- Fmoc-L-Lys[C20-OtBu-γ-Glu(OtBu)-AEEA]-OH
- Fmoc-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH
- Fmoc-Lys C20 side chain building block (single AEEA linker)
- Tirzepatide Impurity 12 / Tirzepatide Impurity 107 (catalog nomenclature)
- CAS 2612237-97-3
Applications
As a raw material, Fmoc-L-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH is commonly evaluated in:
- Solid-phase peptide synthesis and process R&D toward retatrutide and related lipidated incretin peptides
- C20 lipid-modified Fmoc-lysine side-chain installation in GLP-1 / GIP / glucagon peptide analog programs
- Tirzepatide-related peptide intermediate and impurity-reference supply cited in supplier catalogs
- Analytical method development and identity confirmation for protected peptide building blocks
- Catalog purchasing for defined CAS-matched peptide intermediates in laboratory settings
Compare related peptide catalog items such as Retatrutide (CAS 2381089-83-2) and Semaglutide Main Chain P29 (CAS 1169630-82-3) in the same Oligo-peptide / Cosmetics Peptide range.
Handling & Use Notes
- Identity check: Confirm CAS 2612237-97-3, structure and HPLC assay on the batch COA before use.
- Protecting groups: Handle as an Fmoc- and tert-butyl-protected derivative; follow your SPPS SOP for deprotection and coupling steps.
- Storage: Protected peptide intermediates are often moisture- and temperature-sensitive; keep sealed and follow cold-storage guidance on the batch COA / SDS.
- Process fit: Verify solubility in your coupling solvent system (e.g., DMF / DCM mixtures per internal method) before scale-up.
- Safety: Follow the SDS for storage, PPE and waste handling. Use the batch SDS as the controlling safety document.
Need assay or packing discussion? Email [email protected] or use the contact form.
Packaging, Storage & Logistics
| Standard Pack Sizes | 50 g / 100 g bottles; 500 g / 1 kg packs (custom packing available) |
|---|---|
| Storage | Keep sealed, dry and protected from light and moisture; follow cold-storage guidance on the batch COA and SDS |
| Shelf Life | Confirm shelf life on the COA for each lot |
| MOQ | Discussed per project. Paid evaluation quantities are available on quotation (not free). |
| Lead Time | Confirmed after stock availability, packing, and shipping terms are agreed |
Quality & Documentation
For Fmoc-L-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH (CAS 2612237-97-3), Monuo Chemical can provide:
- Certificate of Analysis (COA)
- Technical Data Sheet (TDS) and Safety Data Sheet (SDS)
- CAS / product-name confirmation for your purchase file
- Flexible packing from grams to kilograms
- FOB / CIF / DAP terms as agreed
Our team aims to return technical data and quotations within 24 hours. See also Oligo-peptide / Cosmetics Peptide.
Request a Quote
Share your target assay, pack size and destination. We will confirm availability and documentation for CAS 2612237-97-3.
Request a Quote | Email: [email protected]
Frequently Asked Questions
What is CAS 2612237-97-3?
It is Fmoc-L-Lys[C20-OtBu-Glu(OtBu)-AEEA]-OH, a protected C20 lipidated lysine side-chain building block widely catalogued as retatrutide intermediate or retatrutide linker. Monuo Chemical lists it under Oligo-peptide / Cosmetics Peptide.
How is this compound used in peptide synthesis?
Supplier and peptide-chemistry references describe it as an Fmoc-Lys C20 side-chain intermediate for SPPS assembly of lipidated incretin peptides, including retatrutide-related routes and certain tirzepatide-related sequences.
Is this finished retatrutide API?
No. This listing is for a protected peptide building block / process intermediate—not finished drug substance. Confirm the correct CAS and grade on your RFQ.
Is it a cosmetic skin-care peptide?
No. It is categorized in the peptide catalog for procurement convenience, not as a topical cosmetic active claim.
What is the molecular formula and weight?
Molecular formula C60H94N4O13; molecular weight about 1079.41 g/mol. Confirm on the batch COA/TDS.
What specification does Monuo Chemical supply?
Catalog listing notes 98%; exact assay and impurity profile are confirmed on the Certificate of Analysis for each lot. Share your target specification when you request a quote.
How should this intermediate be stored?
Keep sealed, dry and protected from moisture; follow cold-storage and light-protection guidance on the batch COA and SDS.
Which related peptide products can I review?
You may also review Retatrutide (CAS 2381089-83-2) and Glutathione (CAS 70-18-8), or open the full Oligo-peptide / Cosmetics Peptide catalog.
Related Products
- Retatrutide (CAS 2381089-83-2)
- Semaglutide Main Chain P29 (CAS 1169630-82-3)
- Glutathione (CAS 70-18-8)
- View all Oligo-peptide / Cosmetics Peptide
Disclaimer: Information is for specialty peptide raw-material identification and technical reference. This material is supplied for research / process-development use as described on the COA—not as a finished pharmaceutical, cosmetic or consumer product. Finished-product claims and regulatory filings remain the customer’s responsibility. Verify each lot against the supplied COA and SDS. Trade terms are FOB / CIF / DAP as agreed.
