Fmoc-Cys(Trt)-OH (CAS 103213-32-7), also called Nα-Fmoc-S-trityl-L-cysteine, is the standard Fmoc-SPPS building block for cysteine. The thiol is protected as the S-triphenylmethyl (Trt) thioether, which is part of the Fmoc-cysteine trityl thioether class. Cysteine's free thiol is one of the most reactive amino acid side chains. Fmoc-Cys(Trt)-OH is a critical raw material for making cyclic peptides like Octreotide, Desmopressin, and Lanreotide.
As a pharmaceutical-grade building block and reference standard for disulfide-bridged cyclic peptide synthesis and quality control, ApiSyn offers Fmoc-Cys(Trt)-OH (CAS 103213-32-7).
| Chemical Name | N-(((9H-fluoren-9-yl)methoxy)carbonyl)-S-trityl-L-cysteine |
| Molecular Formula | C37H31NO4S |
| Molecular Weight | 585.7 |
| CAS Number | 103213-32-7 |