Biotin and derivatives
Medchemexpress LLC N-succinimidyl-3-(2-pyridyldithio)butyrate | 107348-47-0 | MFCD28398150 | 98.3% | 326.4 g/mol | C13H14N2O4S2 | 1 G
PPC-NHS ester (N-succinimidyl-3-(2-pyridyldithio)butyrate, CAS 107348-47-0) is an NHS-activated cleavable linker reagent used for conjugating small molecules to proteins and antibodies. It reacts with primary amines to form stable amide bonds and contains a pyridyldisulfide moiety that enables controlled cleavage under reducing conditions, making it suitable for antibody-drug conjugate synthesis and general bioconjugation.
- Reacts with primary amines to form stable amide bonds.
- Contains a pyridyldisulfide cleavable linkage for controlled release under reducing conditions.
- High purity suitable for conjugation workflows (≈98.3%).
- Compatible with common aqueous and organic conjugation conditions.
Medchemexpress LLC Alexa fluor 647 NHS ester | 1620475-28-6 | 95.0% | 942.06 g/mol | C39H47N3O16S4 | 10 MG
Alexa Fluor 647 NHS ester is a far-red, amine-reactive fluorescent dye (succinimidyl ester) used to covalently label primary amines on proteins, peptides, and amine-modified oligonucleotides for fluorescence imaging and flow cytometry.
- Far-red, bright, and photostable fluorescent dye suitable for imaging and flow cytometry.
- Amine-reactive NHS (succinimidyl) ester enables covalent labeling of primary amines.
- Compatible with proteins, peptides, and amine-modified oligonucleotides.
- High purity (95.0%) for reliable conjugation performance.
- Supplied as a solid; store sealed at -20°C, protected from moisture and light.
- COA, SDS, and handling documents available to support safe use and quality verification.
Medchemexpress LLC Bis-PEG13-NHS ester | 2221949-00-2 | 98.0% | 884.92 g/mol | C38H64N2O21 | 25 MG
Bis-PEG13-NHS ester is a PEG-based N-hydroxysuccinimide (NHS) ester linker for research use in the synthesis of antibody-drug conjugates (ADCs) and proteolysis targeting chimeras (PROTACs).
- Provides a bifunctional PEG13 spacer for conjugation to amines.
- Reactive NHS ester termini enable efficient coupling.
- High purity suitable for research applications.
- Molecular weight approximately 884.92 g/mol; molecular formula C38H64N2O21.
- Available in small pack sizes for research-scale synthesis.
Chem-Impex International, Inc. (+) Biotinyl-6-aminohexanoic acid | 72040-64-3 | MFCD00144853 | 250MG
(+) Biotinyl-6-aminohexanoic acid, 72040-64-3, MFCD00144853, 250MG
Medchemexpress LLC N-Mal-N-bis(PEG2-NHS ester) | 2182601-73-4 | 98.9% | C29H38N4O15 | 25 MG
N-Mal-N-bis(PEG2-NHS ester) is a PEG-based PROTAC linker utilized in the synthesis of PROTACs. PROTACs employ two distinct ligands connected by a linker; one ligand targets an E3 ubiquitin ligase, and the other targets a specific protein. These compounds leverage the intracellular ubiquitin-proteasome system for selective degradation of target proteins. This product is for research use only.
- PEG-based PROTAC linker
- Supports synthesis of PROTACs
- Exploits ubiquitin-proteasome system
- Enables selective degradation of target proteins
- Store at -20°C, protected from light and under nitrogen
- Soluble in DMSO (100 mg/mL)
![eMolecules 2353409-89-7 | Azido-PEG11-[4-(5-(1-hydroxyethyl)-2-methoxy-4-nitrophenoxy)-butanamide] | Broadpharm851.945 | C37H65N5O17 | 96.000 | COc1cc(c(cc1OCCCC(=O)NCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCN=[N+]=[N-])C(C)O)[N+]([O-])=O | 100mg | 445408999](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502183507.JPG-250.jpg)
eMolecules 2353409-89-7 | Azido-PEG11-[4-(5-(1-hydroxyethyl)-2-methoxy-4-nitrophenoxy)-butanamide] | Broadpharm851.945 | C37H65N5O17 | 96.000 | COc1cc(c(cc1OCCCC(=O)NCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCN=[N+]=[N-])C(C)O)[N+]([O-])=O | 100mg | 445408999
Azido-PEG11-[4-(5-(1-hydroxyethyl)-2-methoxy-4-nitrophenoxy)-butanamide] | Broadpharm | 2353409-89-7851.945 | C37H65N5O17 | 96.000 | COc1cc(c(cc1OCCCC(=O)NCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCN=[N+]=[N-])C(C)O)[N+]([O-])=O | 100mg | 445408999