5-Aminofluorescein 5-amino-3',6'-dihydroxy-spiro[isobenzofuran-3,9'-xanthene]-1-one 51649-83-3 Fluorescein amine II Fluorescein amine isomer II Fluorescein, 6-amino- (7CI) Fluoresceinamine Isomer II Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 6-amino-3',6'-dihydroxy- CAS 51649-83-3

Purity 97%+In StockPharmaceutical Standards
CAS No.51649-83-3
Molecular FormulaC20H31NO5
Molecular Weight365.46 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

5-Aminofluorescein 5-amino-3',6'-dihydroxy-spiro[isobenzofuran-3,9'-xanthene]-1-one 51649-83-3 Fluorescein amine II Fluorescein amine isomer II Fluorescein, 6-amino- (7CI) Fluoresceinamine Isomer II Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 6-amino-3',6'-dihydroxy- CAS 51649-83-3 chemical structure

Description

Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.

5-Aminofluorescein 5-amino-3',6'-dihydroxy-spiro[isobenzofuran-3,9'-xanthene]-1-one 51649-83-3 Fluorescein amine II Fluorescein amine isomer II Fluorescein, 6-amino- (7CI) Fluoresceinamine Isomer II Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 6-amino-3',6'-dihydroxy- (CAS 51649-83-3) is a high-purity analytical reference standard with the molecular formula C20H31NO5 and a molecular weight of 365.46 g/mol.

Structurally, 5-Aminofluorescein 5-amino-3',6'-dihydroxy-spiro[isobenzofuran-3,9'-xanthene]-1-one 51649-83-3 Fluorescein amine II Fluorescein amine isomer II Fluorescein, 6-amino- (7CI) Fluoresceinamine Isomer II Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 6-amino-3',6'-dihydroxy- (C20H31NO5) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 365.46 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).

As a certified reference material (CRM), 5-Aminofluorescein 5-amino-3',6'-dihydroxy-spiro[isobenzofuran-3,9'-xanthene]-1-one 51649-83-3 Fluorescein amine II Fluorescein amine isomer II Fluorescein, 6-amino- (7CI) Fluoresceinamine Isomer II Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 6-amino-3',6'-dihydroxy- meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.

Physical & Chemical Properties

Molecular FormulaC20H31NO5
Molecular Weight365.46 g/mol
AppearanceOff-white to pale yellow crystalline powder
Purity97%+
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)6.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1971
Nitrogen Atoms1

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