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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Fluorescein, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Fluorescein impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Fluorescein-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Fluorescein Related Compounds

API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fluorescein Sodium API CS-T-74595 518-47-8 In Stock
Dibenzylfluorescein API CS-T-88199 97744-44-0 Enquire
Fluorescein API CS-T-54762 2321-07-5 Enquire
Fluorescein Biotin API CS-T-77664 134759-22-1 Enquire
Fluorescein Dibutyrate API CS-T-75167 7298-65-9 Enquire
Fluoresceinamine API CS-T-75581 27599-63-9 Enquire
Fluorescein-dUTP API CS-T-75707 214154-36-6 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fluorescein Monoacetate Impurity CS-O-47455 7262-41-1 Enquire
O-Mono Acetyl Fluorescein Impurity CS-EO-03267 1104-16-1 Enquire
Phthalic Acid Impurity CS-T-39867 88-99-3 In Stock
(L)-2-[(t-Boc)amino]-2-[(5-Fluoresceinyl)aminocarbonyl]ethyl... Impurity CS-T-49482 1042688-20-9 Enquire
2-[(5-Fluoresceinyl)aminocarbonyl]ethyl Methanethiosulfonate Impurity CS-T-54789 351330-42-2 Enquire
5(6)-Carboxy-2,7-dichlorofluorescein diacetate N-succinimidy... Impurity CS-T-50316 147265-60-9 Enquire
5(6)-Carboxyfluorescein Diisobutyrate Impurity CS-T-50331 287111-44-8 Enquire
5(6)-Nitrofluorescein Impurity CS-DL-00620 78512-32-0 Enquire
6-(Fluorescein-5-carboxamido)hexanoic Acid Succinimidyl Este... Impurity CS-T-54769 148356-00-7 Enquire
6-[Fluorescein-5(6)-carboxamido]hexanoic acid N-hydroxysucci... Impurity CS-T-77174 114616-31-8 Enquire
6-Carboxy-2,7-dichlorofluorescein 3,6-Diacetate Succinimidyl... Impurity CS-T-50314 852299-81-1 Enquire
6-Carboxyfluorescein 3',6'-Dipivaloyl N-(1-Methylethyl)-2-pr... Impurity CS-T-50335 847569-43-1 Enquire
Diacetylfluorescein Impurity CS-T-52382 596-09-8 Enquire
Fluorescein 5-Isothiocyanate, Isomer 1 Impurity CS-T-23806 3326-32-7 Enquire
Fluorescein 5-Maleimide Impurity CS-T-54771 75350-46-8 Enquire
Fluorescein 6-Isothiocyanate, Isomer 2 Impurity CS-T-23807 18861-78-4 Enquire
Fluorescein 6-Maleimide Impurity CS-T-54775 161598-40-9 Enquire
Fluorescein Alkynylamino-ATP Impurity CS-T-54763 185971-89-5 Enquire
Fluorescein-5-iodoacetamide Impurity CS-DL-00736 63368-54-7 Enquire
Fluoresceinamine Hydrochloride Isomer 1 Impurity CS-T-54765 53360-53-5 Enquire
Fluoresceinamine, Isomer 1 Impurity CS-T-54764 3326-34-9 Enquire
Fluoresceinamine, Isomer 2, Impurity CS-T-54766 51649-83-3 Enquire
Fluorescein-Cadaverine Dihydrobromide Impurity CS-T-54768 786705-84-8 Enquire
Fluorescein-O’-acetic Acid Impurity CS-T-75810 233759-98-3 Enquire
N-(5-Fluoresceinyl)-L-carnitine-O-thiocarbamate Impurity CS-T-54790 1258239-73-4 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-(2,4-Dihydroxy-3,5-diiodobenzoyl)benzoic acid Intermediate CS-BX-02729 3480-21-5 In Stock


Glucuronide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fluorescein Glucuronide Glucuronide CS-B-00279 74804-84-5 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2,4,5-TRIIODOFLUORESCEIN Fine Chemicals CS-O-34358 56254-06-9 Enquire
2,4,7-TRIIODOFLUORESCEIN Fine Chemicals CS-O-34359 83498-90-2 Enquire
2-MONOIODOFLUORESCEIN,DISODIUM SALT Fine Chemicals CS-O-34360 52010-85-2 Enquire
4-MONOIODOFLUORESCEIN,DISODIUM SALT Fine Chemicals CS-O-34361 52010-86-3 Enquire
5-(N-Dodecanoyl)aminofluorescein Fine Chemicals CS-ZH-37470 107827-77-0 Enquire
Biotin-4-Fluorescein Fine Chemicals CS-T-49125 1032732-74-3 Enquire


Polymers

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Poly(fluorescein O-methacrylate) Polymers CS-PM-00083 Not Available Enquire
Poly(styrene–co–fluorescein O-methacrylate), random Polymers CS-PM-00752 Not Available Enquire


Biochemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fluorescein Sodium Salt (C.I. No. 45350) for cell culture, E... Biochemicals CS-SR-00496 518-47-8 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fluorescein O-methacrylate Building Blocks CS-PM-01721 480439-15-4 Enquire


Dyes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4,5,6,7-Tetrachloro-2′,4′,5′,7′-tetrabromofluorescein Dyes CS-BL-00029 13473-26-2 Enquire