The products listed are ones we have successfully synthesised or sourced including pharmaceutical &amp; agrochemical impurities, intermediates and fine chemicals. These are intended to display our ability in custom synthesis and sourcing but the list is not exhaustive, and we do not hold stock of all these items. Please <a href="https://www.fbpharmtech.com/contact">contact us</a> with your product enquiries to find out how we can help

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1-Phenyl-3-(piperidin-1-yl) propan-1-one hydrochloride; CAS 886-06-6 is a compound which shows antibacterial, antifungal and antitumor activity.

PHARMACEUTICAL IMPURITY REFERENCE STANDARDS

1-Phenyl-3-(piperidin-1-yl) propan-1-one hydrochloride

3,5-Dichloro-2,6-dimethylpyridin-4-amine, CAS 50978-40-0 is an impurity of Clopidol, an antibiotic

3,5-Dichloro-2,6-dimethyl-pyridin-4-amine

3-O-Demethylcolchicine; N-[(7S)-5,6,7,9-Tetrahydro-3-hydroxy-1,2,10-trimethoxy-9-oxobenzo[a]heptalen-7-yl]-acetamide; CAS 7336-33-6 is a metabolite of Colchicine

3-O-Demethylcolchicine

4-Epi Doxycycline, CAS 6543-77-7 is an impurity of doxycycline and can be used as an alternative to doxycycline to control gene expression

4-Epi Doxycyline

5-Chloro Hydrochlorothiazide; CAS 5233-42-1 is an impurity of Hydrochlorothiazide, a diuretic agent

5-chloro hydrochlorothiazide

6-Hydroxymethylpterin; CAS 712-29-8 is an intermediate in the synthesis of 2-Amino-6-(chloromethyl)-4(3H)-pteridinone and an impurity of Folic Acid

6-Hydroxymethylpterin

Abacavir Impurity 1; CAS 120503-69-7; 2-Amino-6-cyclopropylamino-9H-purine is an impurity of Abacavir Sulfate, a nucleoside reverse transcriptase inhibitor

Abacavir Impurity 1

Abacavir Related Compound A; CAS 124752-25-6 is an intermediate and impurity of Abacavir, a nucleoside reverse transcriptase inhibitor

Abacavir Related Compound A

Acetylcysteine impurity D; CAS 18725-37-6 is an impurity of Acetylcysteine, a medication that is used to treat paracetamol overdose, and to loosen thick mucus in individuals with cystic fibrosis or chronic obstructive pulmonary disease.

Acetylcysteine impurity D

Alvimopan D5 Metabolite, A deuterium labelled analogue of a metabolite of Alvimopan

Alvimopan D5 Metabolite

Amiodarone Related Compound D; CAS 1951-26-4 is an impurity of Amiodarone an antiarrhythmic, non-selective ion channel blocker used to treat irregular heartbeats.

Amiodarone EP Impurity D

Amitriptyline Hydrochloride Impurity; CAS 3707-33-3 (10,11-Dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene)acetic Acid; CAS 3707-33-3 is an impurity of Amitriptyline Hydrochloride, a tricyclic antidepressant used to treat major depressive disorders and a variety of pain syndromes.

Amitriptyline Hydrochloride Impurity

Amoxicillin alpha penicilloic acid is an impurity of Amoxicillin formed by degradation

Amoxicillin Alpha Penicilloic Acid

Amoxicillin Dimer Impurity (penicilloic acid form, mixture of diastereoisomers); CAS 210289-72-8 is the dimer impurity of Amoxicllin

Amoxicillin Penicilloic Acid Dimer

Anastrozole Impurity A; CAS 918312-71-7 is a dimer impurity of Anastrozole

Anastrozole Impurity A

Anastrozole impurity E; CAS 120511-88-8; (2-[3-(Cyanodimethylmethyl)-5-hydroxymethylphenyl]-2-methylpropionitrile) is an impurity of Anastrazole, a medication used to treat hormone receptor-positive breast cancer.

Anastrozole Impurity E

Atorvastatin 3S 5R Impurity; CAS 887196-25-0; Atorvastatin USP Related Compound B is an isomeric impurity of Atorvastatin

Atorvastatin 3S 5R Impurity

Atorvastatin (3S,5S) Impurity Calcium Salt; CAS 1105067-88-6 is an isomeric impurity of Atorvastatin

Atorvastatin 3S 5S Impurity

Atorvastatin Methyl; CAS 345891-62-5 is an impurity of Atorvastatin, a statin medication used to prevent cardiovascular disease

Atorvastatin Methyl

Azelastine Impurity B, 1-Benzoyl-2-[(4RS)-1-methylhexahydro-1H-azepin-4-yl]diazane Dihydrochloride is an impurity of Azelastine, a medication primarily used as a nasal spray to treat allergic rhinitis and as eye drops for allergic conjunctivitis.

Azelastine Impurity B

Benzydamine Hydrochloride Impurity A; CAS 2196185-65-4 is an impurity of Benzydamine, a locally-acting nonsteroidal anti-inflammatory drug

Benzydamine Hydrochloride Impurity A

Benzydamine Hydrochlroide Impurity B, 3-(1,5-Dibenzyl-1H-indazol-3-yl)oxypropyldimethylamine hydrochloride; CAS 2196183-71-6 is an impurity of Benzydamine, a locally-acting nonsteroidal anti-inflammatory drug

Benzydamine Hydrochloride Impurity B

Benzydamine Hydrochloride Impurity C, 1-benzyl-1H-indazol-3-ol hydrochloride is an impurity of Benzydamine, a locally-acting nonsteroidal anti-inflammatory drug

Benzydamine Hydrochloride Impurity C

Betahistine EP Impurity C Trihydrochloride, N-methyl-2-(pyridin-2-yl)-N-[2-(pyridine-2-yl)ethyl]ethanamine trihydrochloride is an impurity of Betahistine, an anti-vertigo medicine

Betahistine Impurity C

Betamethasone 21-valerate; CAS 2240-28-0 is an impurity of Betamethasone, a broad application steroid

Betamethasone 21-Valerate

Bufexamac impurity B; CAS 29056-06-2 is an impurity of Bufexamac, a topical anti-inflammatory agent

Bufexamac Impurity B

Capecitabine Isomer; pentyl {1-[(2S,3R,4S,5R)-3,4-dihydroxy-5-methyloxolan-2-yl]-5-fluoro-2-oxo-1,2-dihydropyrimidin-4-yl}carbamate

Capecitabine Isomer

Cefepime D8 Sulfate is a labelled analogue of the cephalosporin antibiotic Cefepime

Cefepime D8 Sulfate

Ceftriaxone EP Impurity B; 3-Desacetyl Cefotaxime Lactone; CAS 66340-33-8 is an impurity of Ceftriaxone and a degradation product of several other cephalosporin antibiotics

Ceftriaxone Impurity B

Ceftriaxone Impurity C; CAS 58909-39-0 is an impurity of Ceftriaxone, a cephalosporin antibiotic

Ceftriaxone Impurity C

Ceftriaxone Impurity D; S-(Benzothiazol-2-yl)(2-Aminothiazol-4-yl)(methoxyimino)thioacetate; CAS 80756-85-0 is an impurity of Ceftriaxone, a cephalosporin antibiotic

Ceftriaxone Impurity D

Ceftriaxone Impurity E; CAS 58909-56-1 is an impurity of Ceftriaxone

Ceftriaxone Impurity E

Celecoxib-d7 isomer; 1-[4-(methanesulfonyl)phenyl]-5-[4-methyl(2H4)phenyl]-3-(trifluoromethyl)-1H-pyrazole; CAS 544686-21-7 is a deuterium labelled derivative of Celecoxib, a COX-2 selective nonsteroidal anti-inflammatory drug

Celecoxib D7 Isomer

Cephaeline dihydrochloride dihydrate; CAS 5853-29-2 is an alkaloid extracted from Cephaelis ipecacuanha and other plant species including Psychotria acuminata. It is used to induce vomiting

Cephaeline Dihydrochloride Dihydrate

Chlorpromazine impurity D; CAS 3953-65-9 is an impurity of Chlorpromazine, an antipsychotic medication

Chlorpromazine Impurity D Hydrochloride

Cinnarizine Impurity D; 1-(Diphenylmethyl)-4-[(1RS,3E)-4-phenyl-1-[(E)-2-phenylethenyl)-3-buten-1-yl]piperazine; CAS 1199751-98-8 is an impurity of Cinnarizine, an antihistamine and calcium channel blocker API

Cinnarizine Impurity D

Citalopram Hydrochloride

Citalopram Impurity A; 1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-2-benzofuran-5-carboxamide; CAS 64372-56-1 is an impurity of Citalopram, a serotonin (5-HT) uptake inhibitor

Citalopram Impurity A

Citalopram Related Compound D; 1-(4-fluorophenyl)-1-[3-(methylamino)propyl]-1,3-dihydro-2-benzofuran-5-carbonitrile; CAS 62498-67-3 is an impurity of Citalopram, a serotonin (5-HT) uptake inhibitor

Citalopram Related Compound D

Clarithromycin N-Desmethyl; CAS 101666-68-6 is an impurity and metabolite of Clarithromycin, an antibiotic used to treat a wide range of infections.

Clarithromycin Impurity D

Clarithromycin N-Desmethyl; N-Demethyl-6-O-methylerythromycin; CAS 101666-68-6 is an impurity and metabolite of Clarithromycin, an antibiotic used to treat a wide range of infections.

Clarithromycin N-Desmethyl

Clavulanate Lithium; CAS 58001-44-8 is the lithium salt of Clavulanic acid, an anti-bacterial compound that works through inhibition of β-lactamase

Clavulanate Lithium

Clavulanic Acid Impurity G; CAS 374816-32-7 is a fermentation impurity formed during the manufacture of Clavulanic Acid

Clavulanic Acid Impurity G

Clopidogrel Impurity A Hydrochloride; CAS 144750-42-5 is an impurity of Clopidogrel, an anti-platelet medicine

Clopidogrel Impurity A Hydrochloride

CPP Lysine; CAS 138247-43-5 is an impurity of Lisinopryl, an angiotensin-converting enzyme inhibitor used to treat high blood pressure

CPP Lysine

1-hydroxyanthracene-9,10-dione; CAS 129-43-1 is an impurity of Dantron

Dantron Impurity

Dehydronorketamine Hydrochloride; 6-Amino-6-(2-chlorophenyl)-2-cyclohexen-1-one Hydrochloride; CAS 1435934-26-1 is an impurity of Ketamine, an anaesthetic.

Dehydronorketamine Hydrochloride

Diclofenac Diethylamine; CAS 78213-16-8 is a salt of diclofenac, a nonsteroidal anti-inflammatory drug (NSAID)

Diclofenac Diethylamine

Dipyridamole Impurity 1; Dipyridamole Tartaric Acid Ester is an impurity of Dipyridamole, is an antiplatelet drug

Dipyridamole Impurity 1

Dipyrimadole Impurity 2; Dipyridamole Di-Tartaric Acid Ester is an impurity of Dipyrimadole, an anti-platelet medication

Dipyrimadole Impurity 2

Disulfamide; CAS 671-88-5 is a benzenedisulfonamide and carbonic anhydrase (CA) inhibitor which exhibits diuretic activity

Disulfamide

1,4-Bis(2,3-dihydro-1,4-benzodioxin-2-ylcarbonyl)piperazine 
Doxazosin Impurity C; CAS 617677-53-9 is an impurity of Doxazosin, a medication used to treat symptoms of an enlarged prostate and high blood pressure.
Purity &gt;98%

For all product enquiries, please email Oliver.smith@fountain-bridge.com

Doxazosin Impurity C

Doxylamine Impurity A Succinate is an isomeric impurity of Doxylamine, an antihistamine used for allergy and cold relief.

Doxylamine Impurity A Succinate Salt

Enoxolone Impurity A; 18α-Glycyrrhetinic Acid; CAS 1449-05-4 is a triterpenoid derivative of the beta-amyrin type obtained from the hydrolysis of glycyrrhizic acid that reversibly blocks gap junction intercellular communication

Enoxolone Impurity A

ent-Aprepitant is the unwanted S,R,S isomer of Aprepitant, an antiemetic drug used to treat chemotherapy related nausea and vomiting.

ent-Aprepitant

Famotidine Impurity C; [3-[[[2-(Diaminomethyleneamino)-4-thiazolyl]methyl ]thio]propionyl]sulfamide Hydrochloride; CAS 76824-17-4 is an impurity and intermediate of Famotidine

Famotidine Impurity C

Famotidine Related Compound E; Bis[(2-guanidino-4-thiazolyl)methyl]disulfide; CAS 129083-44-9 is a disulphide impurity of Famotidine

Famotidine Related Compound E

Fenbendazole Impurity 1 (5-Phenylthio-2-aminobenzimidazole); CAS 53065-28-4 is an impurity of Fenbendazole, a broad spectrum benzimidazole anthelmintic

Fenbendazole Impurity 1

N-desmethyl Flurazepam; CAS 2886-65-9 is an impurity of Flurazepam

Flurazepam N-desmethyl impurity

Flurbiprofen impurity A; α-Methyl-[1,1’-biphenyl]-4-acetic Acid; CAS 6341-72-6 is an impurity of Flurbiprofen, a nonsteroidal anti-inflammatory drug. Also a metabolite of Isopropylbiphenyl.

Flurbiprofen Impurity A

Fluticasone Propionate Impurity D; CAS 73205-13-7 is an impurity of Fluticasone, a steroid using in the treatment of nasal symptoms.

Fluticasone Propionate Impurity D

Fluvastatin Impurity F (sodium salt); Fluvastatin 3-Hydroxy-4,6-diene Sodium Salt; CAS 1207963-21-0 is an impurity &amp; metabolite of Fluvastatin

Fluvastatin Impurity F

Furosemide EP Impurity C (Saluamine); CAS 3086-91-7 is an impurity and metabolite of Furosemide

Furosemide EP Impurity C

Ganciclovir Tripropionate; CAS 177216-32-9 (Ganciclovir EP Impurity J) is related to the API Ganciclovir, an antiviral nucleoside analog structurally related to Acyclovir

Ganciclovir Tripropionate

Gemfibrozil Related Compound A; CAS 500904-61-0 is an impurity of Gemfibrozil, a drug used to treat abnormal blood lipid levels

Gemfibrozil Related Compound A

Hydrocortisone Sodium Sulfobenzoate; CAS 33767-03-2 is a derivative of Hydrocortisone

Hydrocortisone Sodium Sulfobenzoate

Hyoscine Hydrobromide Impurity B; CAS 4684-28-0 is a metabolite and impurity of Scoploamine, a medication used to prevent nausea and vomiting

Hyoscine hydrobromide impurity B

Iminophenazine; 3-(4-chloro-anilino)-10-(4-chloro-phenyl)-10H-phenazin-2-ylideneamine; CAS 102262-55-5 is an impurity of Chlofazimine, a medication used to treat leprosy

Iminophenazine

Indapamide Impurity A; 85440-79-5 in an impurity of Indapamide a diuretic used in the treatment of hypertension and heart failure.

Indapamide Impurity A

Indapamide Impurity B; CAS 63968-75-2 is an impurity of Indapamide, a diuretic used in the treatment of hypertension and heart failure.

Indapamide Impurity B

Indapamide Impurity C; CAS 85392-00-3 is an impurity of Indapamide, a diuretic used in the treatment of hypertension and heart failure

Indapamide Impurity C

Irbesartan Impurity A; 1-(Pentanoylamino)-N-[[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl] cyclopentanecarboxamide, CAS 748812-53-5 is an impurity of Irbesartan, a drug used to treat high blood pressure, heart failure, and diabetic kidney disease.

Irbesartan Impurity A

Ketoconazole Impurity A; 2,3-dehydroketoconazole; CAS 254912-63-5 is an impurity of Ketoconazole

Ketoconazole Impurity A

Ketoprofen Impurity A; CAS 66067-44-5 is an impurity and intermediate of Ketoprofen.

Ketoprofen Impurity A

Labetalol Impurity A Hydrochloride; 2-Hydroxy-5-[1-hydroxy-2-[(1-methyl-3-phenylpropyl)amino] ethyl]benzoic Acid Hydrochloride is an impurity of Labetalol, aa beta-blocker medicine

Labetalol Impurity A

Lacidipine Impurity A; Lacidipine Monomethyl Ester; CAS 103890-81-9 is an impurity of Lacidipine, a calcium channel blocker

Lacidipine Impurity A

Lacidipine Impurity B; Dehydro Lacidipine; CAS 130996-24-6 is an impurity of Lacidipine, a calcium channel blocker

Lacidipine Impurity B

Lacidipine Impurity C; Lacidipine cis Isomer; CAS 103890-79-5 is an impurity of Lacidipine, a calcium channel blocker

Lacidipine Impurity C

Lisinopril EP Impurity C; (2S)-2-[(3S,8aS)-3-(4-Aminobutyl)-1,4-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl]-4- phenylbutanoic Acid (S,S,S-Diketopiperazine); CAS 328385-86-0 is the S,S,S-Diketopiperazine impurity of Lisinopril, an angiotensin-converting enzyme inhibitor class drug used to treat high blood pressure, heart failure, and after heart attacks.

Lisinopril Impurity C

Lisinopril EP Impurity D; (2S)-2-[(3S,8aR)-3-(4-Aminobutyl)-1,4-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl]-4- phenylbutanoic Acid (R,S,S-Diketopiperazine); CAS 219677-82-4 is the R,S,S-Diketopiperazine impurity of Lisinopril, an angiotensin-converting enzyme inhibitor class drug used to treat high blood pressure, heart failure, and after heart attacks.

Lisinopril Impurity D

Loperamide Impurity F; Loperamide N-oxide; CAS 106900-12-3 is the N-Oxide impurity of Loperamide, an anti-diarrhea medication

Loperamide Impurity F

Lorazepam Impurity E; CAS 93955-15-8 is an impurity of Lorazepam, a benzodiazepine used to treat anxiety disorders

Lorazepam Impurity E

Meloxicam Impurity C; CAS 1262333-25-4 is an impurity of Meloxicam, a non-steroidal anti-inflammatory drug.

Meloxicam Impurity C

Meloxicam Impurity D; CA 1331636-17-9 is an impurity of Meloxicam, a non-steroidal anti-inflammatory drug

Meloxicam Impurity D

Methisazone; [(1-Methyl-2-oxoindol-3-ylidene)amino]thiourea; CAS 1910-68-5 is an anti-viral API that works through the inhibition of mRNA and viral protein synthesis.

Methisazone

Methyl 6-bromo-1- methoxynaphthalene-2-carboxylate; CAS 2122548-55-2 is an intermediate used in chemical synthesis and research
Purity &gt; 98%

Methyl 6-bromo-1- methoxynaphthalene-2-carboxylate

Metoclopramide impurity A; N-Acetyl Metoclopramide; CAS 5608-13-9 is an impurity of Metoclopramide, a medication used for stomach and esophageal problems

Metoclopramide Impurity A

Metoprolol Impurity A; C-Desmethyl Metoprolol; CAS 109632-08-8 is an impurity of Metoprolol, a selective β₁ receptor blocker.

Metoprolol Impurity A

1-(4-Chloro-2-2-(2-fluorobenzoyl)phenyl)-2-methyl-1H-imidazole-5-carboxaldehyde is an impurity of Midazolam, a benzodiazepine medication used for anaesthesia and sedation.

Midazolam Impurity

1-[4-Chloro-2-(2-fluorobenzoyl)phenyl]-2-methyl-1H-Imidazole-5-carboxylic Acid
 1-[4-Chloro-2-(2-fluorobenzoyl)phenyl]-2-methyl-1H-Imidazole-5-carboxylic Acid; CAS 151921-06-1 is an impurity of Midazolam, a benzodiazepine used for sedation and anaesthesia.
Purity &gt;98%

Midodrine Impurity A, 1-(2’,5’-Dimethoxyphenyl)-2-aminoethanol, CAS 3600-87-1 is an impurity of Midodrine, a vasopressor/antihypotensive medicine.

Midorine Impurity A

Montelukast Impurity B; Montelukast Styrene; 918972-54-0 is an impurity of Montelukast a leukotriene inhibitor used in the treatment of asthma

Montelukast Impurity B

Montelukast Impurity C; Montelukast Sulfoxide; CAS 909849-96-3 is an impurity of Montelukast a leukotriene inhibitor used in the treatment of asthma

Montelukast Impurity C

Norepinephrine Hydrogen L-Tartrate Monohydrate; CAS 108341-18-0 is a demethylated precursor of epinephrine

Noradrenaline Acid Tartrate

Nortrachelogenine; CAS 34444-37-6 is a natural product found in Passerina corymbosa

Nortrachelogenine

2-(2-Aminoanilino)-5-methylthiophene-3-carbonitrile; CAS 873895-41-1 is an impurity of Olanzapine, an antipsychotic used to treat schizophrenia and bipolar disorder

Olanzapine Impurity

Ondansetron Impurity B (Ondanestron Dimer), CAS 1076198-52-1 is a dimeric impurity of Ondanestron, a medication used to prevent nausea and vomiting caused by cancer chemotherapy, radiation therapy, or surgery.

Ondanestron Dimer

Ondansetron impurity A; CAS 153139-56-1 is an impurity of Ondanestron, a medication used to prevent nausea and vomiting caused by cancer chemotherapy, radiation therapy, or surgery.

Ondansetron impurity A

Dimethyloctadecyl[3-(trihydroxysilyl)propyl] ammonium chloride; CAS 199111-50-7 is an organosilicane metabolite

Organosilicane Metabolite

Ornidazole 15N Hydroxy; CAS 62580-80-7 is a 15N labelled hydroxy derivative of Ornidazole, an antibiotic used to treat some protozoan infections

Products: PHARMACEUTICAL IMPURITY REFERENCE STANDARDS