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

Fentanyl Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Oxofentanyl-d5 Stable Isotopes CS-T-94425 2714485-19-3 Enquire
3-Methylthiofentanyl-d3 Stable Isotopes CS-T-103238 1346602-10-5 Enquire
a-Methyl Fentanyl-d3 Hydrochloride Stable Isotopes CS-T-103171 1246817-79-7 Enquire
Beta-Hydroxy-3-methylfentanyl-d3 Stable Isotopes CS-T-103172 1217640-92-0 Enquire
Fentanyl EP Impurity D-d5 (Phenethyl-d5) Stable Isotopes CS-O-54630 21409-26-7 (Unlabelled) In Stock
Fentanyl-D5 Hydrochloride Stable Isotopes CS-O-52483 2747915-16-6 Enquire
N-Nitroso Fentanyl EP Impurity D-d5 (Phenethyl-d5) Stable Isotopes CS-O-54052 1184873-14-0 (Unlabelled) In Stock
N-Nitroso Fentanyl EP Impurity D-d5 (Phenyl-d5) Stable Isotopes CS-O-53988 1184873-14-0 (Unlabelled) In Stock
N-Nitroso Fentanyl EP Impurity D-d5 (Piperidin-d5) Stable Isotopes CS-O-54059 1184873-14-0 (Unlabelled) Enquire


API Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Butyrfentanyl API Standards CS-EK-00013 1169-70-6 In Stock


Metabolites

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Cyclopentyl fentanyl Metabolites CS-O-48335 2088918-01-6 Enquire
Despropionyl 2-fluorofentanyl Hydrochloride Metabolites CS-O-57352 2306827-07-4 In Stock
Norfentanyl Metabolites CS-CX-00660 1609-66-1 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2'-Fluoro ortho-fluorofentanyl Impurities CS-O-48267 2748343-88-4 Enquire
3-Methylthiofentanyl Impurities CS-O-48272 86052-04-2 Enquire
Benzyl Fentanyl Impurities CS-T-05647 1474-02-8 In Stock
beta-Hydroxyfentanyl Impurities CS-EO-03556 78995-10-5 Enquire
Fentanyl Impurity A Impurities CS-SN-00123 1233011-07-8 Enquire
Furanyl fentanyl (hydrochloride) Impurities CS-O-53035 101365-56-4 Enquire
N-Nitroso Fentanyl EP Impurity B Impurities CS-EO-02655 Not Available In Stock
N-Nitroso Fentanyl EP Impurity D Impurities CS-EO-02595 1184873-14-0 In Stock
N-Nitroso Fentanyl EP Impurity J Impurities CS-EO-02594 1184873-13-9 Enquire
N-Nitroso Fentanyl Impurity 1 Impurities CS-EO-02652 Not Available Enquire
N-Nitroso Fentanyl Impurity 3(Mixture of isomers) Impurities CS-EO-02654 Not Available In Stock
N-phenyl-1-(2-phenylethyl) piperidin-4-amine Impurities CS-O-31567 21409-26-7 In Stock
Phenacyl Fentanyl Impurities CS-O-16354 1796-40-3 Enquire
Phenacyl Fentanyl HCl Impurities CS-O-56358 1796-40-3 (Freebase) In Stock
Thiofuranyl fentanyl Impurities CS-O-48232 2306823-38-9 In Stock


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
o-Fluorobutyryl fentanyl Building Blocks CS-O-48283 2163847-76-3 Enquire
o-Fluorofentanyl Building Blocks CS-O-48309 910616-29-4 Enquire
ortho-Fluoroacryl fentanyl Building Blocks CS-O-48294 2309383-09-1 Enquire
ortho-Fluoroisobutyryl fentanyl Building Blocks CS-O-48278 2351142-33-9 Enquire
ortho-Methyl acetylfentanyl Building Blocks CS-O-48277 90736-11-1 Enquire
ortho-Methyl methoxyacetyl fentanyl Building Blocks CS-O-48276 2748485-22-3 Enquire
Para-chloroisobutyryl fentanyl Building Blocks CS-O-48273 244195-34-4 Enquire
Para-Fluoro furanyl fentanyl Building Blocks CS-O-48271 1802489-71-9 Enquire
Tetrahydrofuranyl fentanyl Building Blocks CS-O-48311 2142571-01-3 Enquire