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

Allopurinol Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Allopurinol-13C,15N2 Stable Isotopes CS-O-03343 315-30-0 (Unlabeled) In Stock
Allopurinol-13C,15N2, D2 Stable Isotopes CS-EO-02398 2465-59-0 unlabelled Enquire
Allopurinol-d2 Stable Isotopes CS-O-03126 916979-34-5 In Stock
Allopurinol 13C4 Stable Isotopes CS-O-15455 315-30-0(Unlabeled) Enquire
Oxipurinol 13C 15N2 Stable Isotopes CS-O-03344 1217036-71-9 Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Allopurinol API CS-O-07146 315-30-0 In Stock
Oxypurinol API CS-O-02049 2465-59-0 In Stock


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(Z)-2-cyano-3-morpholinoacrylamide Impurity CS-O-46766 Not Available Enquire
2-Cyano-3-morpholinoacrylamide Impurity CS-O-47831 25229-97-4 Enquire
3-Aminopyrazole-4-carboxamide Hemisulfate Impurity CS-O-07140 27511-79-1 In Stock
Allopurinol EP Impurity B Impurity CS-O-07141 22407-20-1 In Stock
Allopurinol EP Impurity C Impurity CS-O-07142 1346604-13-4 In Stock
Allopurinol EP Impurity D Impurity CS-O-07143 6994-25-8 In Stock
Allopurinol EP Impurity E Impurity CS-O-07144 31055-19-3 In Stock
Allopurinol EP Impurity H Impurity CS-T-102285 321571-07-7 Enquire
Allopurinol Nitrile Hydrochloride Impurity Impurity CS-EO-03302 478081-97-9 Enquire
Allopurinol Nitrile Impurity Impurity CS-O-07145 16617-46-2 In Stock
Allopurinol Related compound F Impurity CS-T-13617 321571-07-7 In Stock
7N-[1-(2-Carboxy)ethyl]allopurinol Impurity CS-T-50319 34397-00-7 Enquire
Allopurinol EP Impurity B -Formate salt Impurity CS-O-40326 22407-20-1 (Free base) Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Hydrazine Hydrate Fine Chemicals CS-DB-00093 10217-52-4 In Stock


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N-Nitroso Allopurinol Nitrosamine CS-O-38911 ---- Discontinued
N-Nitroso Allopurinol impurity 2 Nitrosamine CS-O-56987 ---- Enquire
7-nitroso-1,7-dihydro-6H-purin-6-one Nitrosamine CS-O-42263 ---- Enquire
7-nitroso-7H-purin-6-ol Nitrosamine CS-O-42262 ---- Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Allopurinol Secondary Standards CS-SS-24377-1GM 315-30-0 Enquire
Allopurinol Related Compound A Secondary Standards CS-SS-24931-50MG 27511-79-1 Enquire
Allopurinol Related Compound B Secondary Standards CS-SS-24932-50MG 22407-20-1 Enquire
Allopurinol Related Compound C Secondary Standards CS-SS-24933-50MG 1346604-13-4 Enquire
Allopurinol Related Compound D Secondary Standards CS-SS-24934-50MG 6994-25-8 Enquire
Allopurinol Related Compound E Secondary Standards CS-SS-24935-50MG 31055-19-3 Enquire
Allopurinol Related Compound F Secondary Standards CS-SS-24907-50MG 321571-07-7 Enquire