Fluorescein Impurity 4 CAS 2318-08-3

Purity >95%In StockPharmacopoeial Impurity Standards
CAS No.2318-08-3
Molecular FormulaC20H12O5
Molecular Weight332.31 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Fluorescein Impurity 4 CAS 2318-08-3 chemical structure

Description

Fluorescein Impurity 4 (CAS 2318-08-3) reference standard, produced by CATO (ISO 17034 / CNAS / ANAB accredited). Molecular formula: C20H12O5. Molecular weight: 332.31 g/mol. Trusted by 10,000+ laboratories worldwide for pharmaceutical analysis and QC.

Physical & Chemical Properties

Molecular FormulaC20H12O5
Molecular Weight332.31 g/mol
AppearancePale yellow to yellow crystalline powder
Purity>95%
StorageStore at 2-8°C, protect from light, keep sealed and dry
Solubility (reference)Soluble in methanol, acetonitrile, DMSO, water (slightly soluble)
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)15.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1957

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