Molekula
N-(alpha)-Fmoc-S-trityl-L-cysteine
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
N-(alpha)-Fmoc-S-trityl-L-cysteine is a protected cysteine derivative used in peptide synthesis to prevent unwanted side reactions during chain elongation. It is a key building block for introducing cysteine residues with selective protection. CAS: 103213-32-7, Molecular Formula: C37H31NO4S, Molecular Weight: 585.71 g/mol, Storage: 2 to 8 °C.
Molekula supplies N-(alpha)-Fmoc-S-trityl-L-cysteine in 5 g packs, from $112.40 excl. VAT. It is made or sourced to order. Every batch ships with a certificate of analysis, and a safety data sheet is available. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
On backorder — expected to ship by 6 December 2026
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — $112.40 per pack
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Solid |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 66634689 |
| CAS Number | 103213-32-7 |
| IUPAC Name | (2R)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-tritylsulfanylpropanoic acid |
| Molecular Formula | C37H31NO4S |
| Molecular Weight | 585.71 |
| Exact Mass | 585.1974 |
| SMILES | C1=CC=C(C=C1)C(C2=CC=CC=C2)(C3=CC=CC=C3)SC[C@@H](C(=O)O)NC(=O)OCC4C5=CC=CC=C5C6=CC=CC=C46 |
| InChIKey | KLBPUVPNPAJWHZ-UMSFTDKQSA-N |
| InChI | InChI=1S/C37H31NO4S/c39-35(40)34(38-36(41)42-24-33-31-22-12-10-20-29(31)30-21-11-13-23-32(30)33)25-43-37(26-14-4-1-5-15-26,27-16-6-2-7-17-27)28-18-8-3-9-19-28/h1-23,33-34H,24-25H2,(H,38,41)(H,39,40)/t34-/m0/s1 |
| PubChem CID | 128239 |
| REACH Code | Y113 |
| HTS Code | 29309016 |
| Tariff Code | 2930901600 |
Safety & GHS
Detailed safety information available in the SDS — see Documents below.
Documents
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- (2R)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-tritylsulfanylpropanoic acid
- Fmoc-Cys(Trt)-OH
- Fmoc-L-Cys(Trt)-OH
- Fmoc-S-trityl-cys
- FMOC-S-trityl-L-cysteine
- L-Cysteine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]-S-(triphenylmethyl)-
- N-(((9H-Fluoren-9-yl)methoxy)carbonyl)-S-trityl-L-cysteine
- N-[(9H-Fluoren-9-ylmethoxy)carbonyl]-S-(triphenylmethyl)-L-cysteine
- N-Fmoc-S-trityl-L-cysteine
- N(alpha)-Fluorenylmethyloxycarbonyl-S-tritylcysteine
Frequently asked questions
What is N-(alpha)-Fmoc-S-trityl-L-cysteine used for?
It is primarily used as a protected amino acid building block in peptide synthesis, particularly for introducing cysteine residues with orthogonal protection.
What is the chemical formula and molecular weight?
The formula is C37H31NO4S with a molecular weight of 585.71 g/mol.
How should this compound be stored?
Store at 2 to 8 °C in a cool, dry place, protected from light and moisture.
What grade is available?
It is supplied as a solid for peptide synthesis and other laboratory applications. Please contact our sales team for grade and purity details.
Can Molekula supply this in bulk?
Yes, Molekula can supply N-(alpha)-Fmoc-S-trityl-L-cysteine in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS); additional documentation can be provided upon request.
Where can I buy N-(alpha)-Fmoc-S-trityl-L-cysteine?
Directly from Molekula, which lists N-(alpha)-Fmoc-S-trityl-L-cysteine in 5 g packs from $112.40 excl. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.