Coumarin 343 X NHS ester

Coumarin 343 X NHS ester is an amine-reactive fluorescent labeling reagent with an activated NHS ester group used primarily in the biotechnology and diagnostics industries. Key applications include covalent labeling of proteins and peptides through primary amines and construction of fret-based assays and fluorescent bioconjugates.

ChemContract Research is a trusted USA-based supplier of Coumarin 343 X NHS ester. We offer competitive pricing, fast shipping from our U.S. location, and full quality documentation including Certificates of Analysis (CoA). Request a quote at chemistry@chem-contract.com or call +1 (714) 732-8549.

ChemContract Research supplies Coumarin 343 X NHS ester in multiple purity grades: ≥95% standard grade, ≥97% high-purity grade, and ≥99% ultra-high-purity grade depending on application requirements. We can also provide custom purity grades through our synthesis capabilities. Contact us for specific purity information and CoA documentation.

Yes. ChemContract Research offers custom synthesis services for Coumarin 343 X NHS ester from milligram to multi-kilogram scale. Our cGMP-compliant facilities and experienced chemists can accommodate custom specifications, packaging requirements, and delivery timelines. Contact our team to discuss your project.

Store desiccated at –20 °C in the dark. Avoid prolonged exposure to light and moisture. Always consult the compound-specific Safety Data Sheet (SDS) provided with your order for detailed storage requirements. ChemContract Research includes handling and storage documentation with every shipment.

The CAS Registry Number for Coumarin 343 X NHS ester is 946123-12-2. This unique identifier is used worldwide to reference this specific compound in chemical databases, regulatory filings, and scientific literature. ChemContract Research supplies this compound with full quality documentation. Contact us at chemistry@chem-contract.com for availability and pricing.