6359-05-3 Benzoic acid, 2- (2,4,5, 7-tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)-, ethyl ester C.I. 45386 (*Potassium salt*) C.I. Solvent Red 45 (*Potassium salt*) Ethyl eosin Fluorescein, 2',4',5',7'-tetrabromo-, ethyl ester NSC8670 Spirit Primrose DH (*Potassium salt*) ethyl 2-(2,4,5,7-tetrabromo-3-hydroxy-6-oxo-xanthen-9-yl)benzoate CAS 6359-05-3

Purity 97%+In StockPharmaceutical Standards
CAS No.6359-05-3
Molecular FormulaC22H23Br4O5
Molecular WeightN/A
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

6359-05-3 Benzoic acid, 2- (2,4,5, 7-tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)-, ethyl ester C.I. 45386 (*Potassium salt*) C.I. Solvent Red 45 (*Potassium salt*) Ethyl eosin Fluorescein, 2',4',5',7'-tetrabromo-, ethyl ester NSC8670 Spirit Primrose DH (*Potassium salt*) ethyl 2-(2,4,5,7-tetrabromo-3-hydroxy-6-oxo-xanthen-9-yl)benzoate CAS 6359-05-3 chemical structure

Description

6359-05-3 Benzoic acid, 2- (2,4,5, 7-tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)-, ethyl ester C.I. 45386 (*Potassium salt*) C.I. Solvent Red 45 (*Potassium salt*) Ethyl eosin Fluorescein, 2',4',5',7'-tetrabromo-, ethyl ester NSC8670 Spirit Primrose DH (*Potassium salt*) ethyl 2-(2,4,5,7-tetrabromo-3-hydroxy-6-oxo-xanthen-9-yl)benzoate (CAS 6359-05-3) is a high-purity analytical reference standard with the molecular formula C22H23Br4O5K and a molecular weight of 726.13 g/mol.

Structurally, 6359-05-3 Benzoic acid, 2- (2,4,5, 7-tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)-, ethyl ester C.I. 45386 (*Potassium salt*) C.I. Solvent Red 45 (*Potassium salt*) Ethyl eosin Fluorescein, 2',4',5',7'-tetrabromo-, ethyl ester NSC8670 Spirit Primrose DH (*Potassium salt*) ethyl 2-(2,4,5,7-tetrabromo-3-hydroxy-6-oxo-xanthen-9-yl)benzoate (C22H23Br4O5K) contains a salt form, a flavonoid core, a hydroxyl group, an ether linkage, bromine substitution. The molecule exhibits a degree of unsaturation (DBE) of 9.5, corresponding to approximately 9 ring(s) or double-bond equivalent(s). With a molecular weight of 726.13 g/mol, it falls into the high-molecular-weight range. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

Molecular FormulaC22H23Br4O5 K
Molecular Weight726.13 g/mol
Purity97%+
StorageStore at room temperature, 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; Contains ester bond; hydrolyzes under strong alkaline conditions
Degree of Unsaturation (DBE)9.5
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1958
Halogen ContentBr-containing

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