$344.00 - $1033.00
Fmoc-D-Cys(Mmt)-OH (CAS 1198791-73-9) belongs to the protected amino-acid / peptidomimetic building block class. It is used in peptide, peptidomimetic and medicinal-chemistry synthesis, particularly where a sulfur-containing residue with protection selected to manage thiol/thioether reactivity during synthesis is required.
Use when the target structure specifically requires this residue or protection pattern; confirm stereochemistry and deprotection compatibility before substituting it into an established route. Its value is route-specific, so selection should follow the intended transformation rather than the broad category label.
Product Information
| Product Name | Fmoc-D-Cys(Mmt)-OH |
| Catalog No. | AS4205 |
| CAS No. | 1198791-73-9 |
| Molecular Formula | C38H33NO5S |
| Molecular Weight | 615.74 g/mol |
| Compound Type | Protected amino-acid / peptidomimetic building block |
| Primary Research Use | Peptide, peptidomimetic and medicinal-chemistry synthesis |
Why This Building Block Is Distinct
The defining feature of Fmoc-D-Cys(Mmt)-OH is a sulfur-containing residue with protection selected to manage thiol/thioether reactivity during synthesis. That feature can change hydrophobic packing, conformational preference, side-chain reactivity or the route available for later derivatization.
Coupling and Deprotection Fit
Compatibility should be assessed against the full sequence and protection map. A chemically correct residue can still be a poor substitution if its protecting group is removed by conditions required elsewhere in the synthesis.
Compare neighboring reagents in our noncanonical amino acids. Full-sequence work is covered under protected peptide building blocks.
Product Documents
MSDS - Fmoc-D-Cys(Mmt)-OH (AS4205)
The Safety Data Sheet provides product identification, hazard information, handling and storage guidance, exposure controls, transport information, and regulatory information for laboratory use.
Certificates of Analysis (COAs) are batch-specific. Please contact us to request the COA for your product, and we will provide it by email.
Frequently Asked Questions
What is Fmoc-D-Cys(Mmt)-OH mainly used for?
Peptide, peptidomimetic and medicinal-chemistry synthesis.
What is the critical identity check?
Confirm CAS 1198791-73-9, stereochemistry or positional isomer where applicable, and the complete protection state.
What documentation should be matched to the lot?
Use the COA to confirm assay and analytical identity; the nominal formula is C38H33NO5S with molecular weight 615.74 g/mol.