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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Indigo, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Indigo 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 Indigo-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.

Indigo Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Indigo Carmine-d2 Stable Isotopes CS-O-58265 1208610-66-5 Enquire
Indigo-D8 Stable Isotopes CS-T-103310 479-41-4(unlabelled) Enquire
Indigo-D8 (major) Stable Isotopes CS-F-00235 482-89-3 (unlabelled) Enquire
Indigopurpurin-d4 Stable Isotopes CS-T-103703 479-41-4(unlabelled) Enquire
N,N’-Diisopropyl-5,6,5’,6’-tetrahydroxy Indigo-d14 Stable Isotopes CS-T-100433 Not Available Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Indigo Carmine API CS-T-29273 860-22-0 In Stock
Indigotindisulfonate API CS-ED-41927 483-20-5 Enquire
Isoindigo API CS-T-29750 476-34-6 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-Hydroxy-1H-indole-2-carboxaldehyde Impurity CS-O-56313 172984-51-9 Enquire
5-Hydroxy-1H-indole-3-carbaldehyde Impurity CS-O-56354 3414-19-5 Enquire
Indigo Carmine 5,7-Isomer Disodium Impurity CS-P-01487 27414-68-2 Enquire
Indigotindisulfonate Impurity C Impurity CS-O-59156 7313-70-4 Enquire
Indigotindisulfonate Impurity D Impurity CS-O-59159 767607-23-8 Enquire
5,5’,6,6’-Tetrakis(methoxymethoxy)-indigotin Impurity CS-T-86226 858230-17-8 Enquire
7,7'-Bis(4-bromobenzoyl) Isoindigo Impurity CS-O-15557 1798431-98-7 Enquire
Indigo Carmine Related Compound 1 Impurity CS-P-01486 27414-69-3 Enquire
Indigopurpurin Impurity CS-T-29274 479-41-4 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Trisodium indigo-5,5',7'-trisulfonate Intermediate CS-ED-42252 95713-40-9 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Indigo Carmine Nitroso Impurity 1 Nitrosamine CS-O-59161 ---- Enquire
Indigo carmine di nitroso impurity Nitrosamine CS-O-42516 Not Available Enquire
N-Nitroso Indigo carmine Nitrosamine CS-EO-01266 Not Available Enquire