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Specifications

The Fluorescein Arsenical Hairpin Binder (FlAsH) method is presented for fluorescence labeling of proteins in living cells. Labeling proteins with the membrane-permeant fluorogenic biarsenical dye fluorescein arsenical hairpin binder-ethanedithiol (FlAsH-EDT2). The membrane-permeant fluorogenic biarsenicals FlAsH-EDT2 and ReAsH-EDT2 can be prepared in good yields by a straightforward two-step procedure from the inexpensive precursor dyes fluorescein and resorufin.
Catalog #	012039
Melting Point	As reported
Solubility	As reported
Method for Determining Identity	Proton NMR (CDCl3) Spectroscopic and Mass Spectrometric Analysis
Atmosphere	Inert gas
TLC Conditions	As reported
Elemental Analysis	(Calculated): %C: 43.38, %H 2.73
Storage and Stability	May be stored at RT for short-term only. Long-term storage is recommended at -20°C. For maximum recovery of product, centrifuge the original vial prior to removing the cap. Light, temperature, and moisture sensitive. Store under inert atmosphere.
Important Note	This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.
Toxicity and Hazards
	All products should be handled by qualified personnel only, trained in laboratory procedures.
CAS Number	212118-77-9
Molecular Formula	C24H18As2O5S4
Molecular Weight	664.5
Source	Synthetic
Purity	~90%
Form	As reported
Important Note	This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.
Alternate names	4',5'-Bis(1,3,2-dithiarsolan-2-yl)-3',6'-dihydroxyspiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one; FlAsH; Fluorescein Arsenical Helix Binder; Lumio Green;