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

Fumarate Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2R,4R,5R,7S)-Aliskiren-d6 Fumarate (2:1) Stable Isotopes CS-T-97827 Not Available Enquire
(2S,4S,5S,7R)-Aliskiren-d6 Fumarate (2:1) Stable Isotopes CS-T-97828 Not Available Enquire
(S)-Fesoterodine-d7 Fumarate Stable Isotopes CS-T-100308 Not Available Enquire
1,1’-[Oxybis(methylene-4,1-phenyleneoxy)]bis[3-[(1-methyleth... Stable Isotopes CS-T-94349 1225195-71-0(Unlabelled) Enquire
3’-Dechloro-3’-bromo Bupropion-d9 Fumarate Stable Isotopes CS-T-98919 2714418-64-9 Enquire
8-Hydroxy Aliskiren-d3 Fumarate (2:1) Stable Isotopes CS-T-97454 Not Available Enquire
Aliskiren-d6 Hemifumarate Stable Isotopes CS-O-02668 173334-58-2 (Unlabeled) In Stock
Bisoprolol D5 Fumarate Stable Isotopes CS-O-02642 2140803-85-4 Enquire
Bisoprolol D7 (Isopropoxy-D7) Hemifumarate Stable Isotopes CS-O-14432 104344-23-2 (Unlabeled) Enquire
Bisoprolol-d7 Hemifumarate Stable Isotopes CS-T-96152 1310012-17-9 Enquire
Clemastine-d5 Fumarate Stable Isotopes CS-T-97684 Not Available Enquire
Demethoxy Aliskiren-d6 Fumarate (2:1) Stable Isotopes CS-T-97644 Not Available Enquire
Dimethyl Fumarate-d2 Stable Isotopes CS-T-89915 23057-98-9 Enquire
Dronedarone-d6 Fumarate Stable Isotopes CS-O-06569 141626-36-0(Unlabeled)(Freebase) In Stock
Ebastine-D5 Fumarate Stable Isotopes CS-P-00967 1316815-02-7 Enquire
Fesoterodine-d7 Fumarate Stable Isotopes CS-O-06620 2747918-94-9 In Stock
Formoterol-13C-d3 Hemifumarate Stable Isotopes CS-EO-02530 Not Available Enquire
Formoterol-d6 Fumarate Stable Isotopes CS-O-02939 43229-80-7 (Unlabeled) In Stock
Formoterol-d6 Fumarate Stable Isotopes CS-T-95397 Not Available Enquire
Ibutilide Fumarate-d5 Stable Isotopes CS-T-99200 Not Available Enquire
Ketotifen-d3 fumarate Stable Isotopes CS-O-42903 1795138-23-6 Enquire
Monomethyl Fumarate-d5 Stable Isotopes CS-O-20007 1616345-45-9 In Stock
N-Deformyl Formoterol-d6 Fumarate (Mixture of Diastereomers... Stable Isotopes CS-T-97653 1795142-59-4 Enquire
N-Methyl Formoterol-d3 Fumarate (Mixture of Diastereomers) Stable Isotopes CS-T-97311 1795143-40-6 Enquire
N-Nitroso Sitagliptin Fumarate Adduct D4 Stable Isotopes CS-O-44423 Not Available Enquire
O-Desisopropyl-O-ethyl Bisoprolol-d7 Hemifumarate Stable Isotopes CS-T-73456 1346600-13-2 Enquire
O-Desisopropyl-O-methyl Bisoprolol-d7 Hemifumarate Stable Isotopes CS-T-73736 1346600-98-3 Enquire
Quetiapine D4 Fumarate Stable Isotopes CS-EO-02961 1217311-36-8 (free base) Enquire
Quetiapine Tetra Ethylene Glycol Fumarate-d8 Stable Isotopes CS-T-101560 2734435-09-5 Enquire
Quetiapine-d4 (Ethanol-d4) Fumarate Stable Isotopes CS-O-02767 1287376-15-1 In Stock
Quetiapine-d4 (Ethoxy-d4) fumarate Stable Isotopes CS-T-86134 1331636-50-0 Enquire
Quetiapine-d4 (Ethoxy-d4) Hemifumarate Stable Isotopes CS-O-06904 1217310-65-0 In Stock
Quetiapine-d8 Fumarate Stable Isotopes CS-T-86066 1185247-12-4 In Stock
Quetiapine-d8 Hemifumarate Stable Isotopes CS-T-85701 1217310-66-1 In Stock
Quetiapine-d8 Hemifumarate (piperazine-d8) Stable Isotopes CS-T-95529 1435938-24-1 Enquire
rac Fesoterodine D14 Fumarate Stable Isotopes CS-O-02757 1185237-08-4 Enquire
Rupatadine-d4 Fumarate Stable Isotopes CS-T-86055 1795153-63-7 Enquire
Sitagliptin Fumarate Adduct D4 Stable Isotopes CS-O-54332 2088771-60-0(Unlabelled) Enquire
Tenofovir Alafenamide-d5 Fumarate (diastereomers) Stable Isotopes CS-O-16095 379270-38-9(Unlabeled) Enquire
Tenofovir Alafenamide-d6 Fumarate(diastereomers) Stable Isotopes CS-O-53886 390409-17-3 (unlabeled) Enquire
Tenofovir Alafenamide-d7 Fumarate Stable Isotopes CS-T-96337 Not Available Enquire
Tenofovir disoproxil D12 fumarate Stable Isotopes CS-CX-00607 202138-50-9 (Unlabeled) Enquire
Tenofovir Disoproxil-d6 Fumarate Stable Isotopes CS-T-93433 202138-50-9 (Unlabeled) Enquire
Thioproperazine-d3 Difumarate Stable Isotopes CS-T-86946 1331638-03-9 Enquire
Tiamulin-13C4 Fumarate Stable Isotopes CS-T-99073 Not Available Enquire
Trimebutine-D5 Fumarate Stable Isotopes CS-EO-02442 Not Available Enquire
Vonoprazan Fumarate-13C,d3 Stable Isotopes CS-O-32964 881681-01-2 (Unlabeled) In Stock
Vonoprazan Fumarate-d3 Stable Isotopes CS-T-93958 881681-01-2 (Unlabelled) In Stock
Vonoprazan-d4 Fumarate Stable Isotopes CS-EO-02592 881681-01-2(Unlabeled) In Stock
Vonoprazan-d5 Fumarate Stable Isotopes CS-T-94673 2215059-99-5 Enquire


API Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Aliskiren Hemifumarate API Standards CS-O-10994 173334-58-2 In Stock
Bedaquiline fumarate API Standards CS-AN-00009 845533-86-0 In Stock
Bisoprolol Fumarate API Standards CS-M-34855 104344-23-2 In Stock
Bisoprolol hemifumarate API Standards CS-EK-02459 104344-23-2 Enquire
CABOZANTINIB FUMARATE API Standards CS-O-52726 849217-68-1(FREE BASE) Enquire
Clemastine Fumarate API Standards CS-O-06237 14976-57-9 In Stock
Cobimetinib Fumarate API Standards CS-ED-01319 1369665-02-0 Enquire
Cyanopindolol Hemifumarate API Standards CS-T-73373 106469-57-2 Enquire
Domperidone Fumarate API Standards CS-EO-03499 2307515-18-8 Enquire
E & Z Fluvoxamine Fumarate API Standards CS-O-44966 1246666-24-9 In Stock
Emedastine Difumarate API Standards CS-P-00414 87233-62-3 Enquire
Fesoterodine Fumarate API Standards CS-O-30922 286930-03-8 In Stock
Formoterol Fumarate API Standards CS-O-01545 43229-80-7 Enquire
Formoterol fumarate dihydrate API Standards CS-O-01547 183814-30-4 In Stock
Gilteritinib Hemifumarate API Standards CS-O-52638 1254053-84-3 In Stock
GS-7171 fumarate API Standards CS-EK-00845 390409-17-3 Enquire
Ketotifen fumarate API Standards CS-O-01707 34580-14-8 In Stock
Metoprolol Fumarate API Standards CS-O-30668 80274-67-5 In Stock
Phendimetrazine fumarate salt API Standards CS-EK-00515 634-03-7 free base Enquire
Quetiapine Hemifumarate API Standards CS-O-02211 111974-72-2 In Stock
Rilmenidine hemifumarate salt API Standards CS-EK-00604 207572-68-7 Enquire
Rupatadine Fumarate API Standards CS-O-30752 182349-12-8 In Stock
Ruxolitinib Fumarate API Standards CS-O-51568 Not Available In Stock
Ruxolitinib Hemifumarate API Standards CS-O-45668 2803478-47-7 In Stock
Siponimod Fumarate API Standards CS-O-44360 1234627-85-0 In Stock
Sitagliptin Fumarate API Standards CS-EO-03857 837430-24-7 Enquire
Sodium stearyl fumarate API Standards CS-O-11001 4070-80-8 In Stock
Tabimorelin Hemifumarate API Standards CS-T-86463 242143-80-2 Enquire
Tafamidis Fumarate API Standards CS-EO-03872 2641817-21-0 Enquire
Tenofovir Alafenamide Fumarate API Standards CS-AV-00089 379270-38-9 In Stock
Tenofovir Disoproxil Fumarate API Standards CS-M-58137 202138-50-9 In Stock
Tiamulin Hydrogen fumarate API Standards CS-O-02443 55297-96-6 In Stock
Vonoprazan Fumarate API Standards CS-ED-02045 881681-01-2 In Stock
Vonoprazan Fumarate (TAK-438) API Standards CS-O-13856 881681-01-2 In Stock
Zamifenacin fumarate - UK 76654 API Standards CS-CM-00302 127308-98-9 Enquire
Zicronapine Fumarate API Standards CS-T-87865 170381-17-6 Enquire


Metabolites

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(-)-Eseroline fumarate Metabolites CS-T-92318 104015-29-4 Enquire
(N,N-Dimethyltryptamine Fumarate Metabolites CS-O-43786 68677-26-9 Enquire
Desvenlafaxine Fumarate Metabolites CS-EO-03478 93414-04-1 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"(2S,4S,5S,7R)-Aliskiren Fumarate (2:1)" Impurities CS-T-65266 1630036-82-6 Enquire
"2-[2-[2-(4-Dibenzo[b,f][1,4]thiazepin-11-yl-1-piperazinyl)e... Impurities CS-T-52492 1356906-16-5 Enquire
(R)-[4-Benzyloxy-3-(3-diisopropylamino-1-phenylpropyl) – phe... Impurities CS-O-35398 Not Available Enquire
(S)-Fesoterodine Fumarate Impurities CS-EO-00356 1431511-18-0(Free base) Enquire
(S)-Fesoterodine Fumarate Impurities CS-T-54697 1431511-18-0 Enquire
(S)-Tenofovir Disoproxil Fumarate Impurities CS-T-61641 1432630-26-6 In Stock
1,4,5,6-tetrahydropyridin Vonoprazan Fumarate Impurities CS-O-53542 Not Available Enquire
2-(2,5-Dioxopyrrolidin-1-Yl)Ethyl Methyl Fumarate Impurities CS-ZE-03440 1577222-14-0 In Stock
4-chloro Vonoprazan Fumarate Impurities CS-O-53998 2855936-83-1 Enquire
5-chloro Vonoprazan Fumarate Impurities CS-O-50311 Not Available Enquire
5-methyl-10-(2-(piperidin-1-yl)ethoxy)-5,10-dihydrobenzo[c]t... Impurities CS-O-52999 286854-11-3(Free base) Enquire
8-Hydroxy Aliskiren Fumarate (2:1) Impurities CS-T-78529 1438401-04-7 Enquire
Avitriptan Fumarate Impurities CS-O-13100 171171-42-9 Enquire
Bedaquiline fumarate adduct Impurities CS-O-46072 Not Available Enquire
Bedaquiline Fumarate impurity A (Mixture) Impurities CS-O-45569 Not Available Enquire
Bedaquiline Fumarate impurity C Impurities CS-O-45571 Not Available Enquire
Bepotastine Ethyl ester fumarate salt Impurities CS-O-49254 210095-48-0 Enquire
Bisoprolol AMINO Fumarate Impurities CS-O-45980 Not Available Enquire
Bisoprolol EP Impurity B Hemifumarate (Bisoprolol n-Propyl D... Impurities CS-P-07244 1447715-44-7 (free base) In Stock
Bisoprolol EP Impurity G fumarate salt Impurities CS-O-45413 1215342-36-1 (Freebase) Enquire
Bisoprolol OXO Fumarate Impurities CS-O-45979 Not Available Enquire
Cis-7-Hydroxy Didesmethyl Sibutramine Hemifumarate Salt Impurities CS-T-78032 186521-91-5 Enquire
Clemastine Fumarate Impurity A (Mixture of Diastereomers) Impurities CS-P-00896 108825-05-4 In Stock
Clemastine Fumarate Impurity B HCl Impurities CS-P-00897 61771-18-4 (freebase) In Stock
Clemastine Fumarate Impurity C Impurities CS-P-00898 59767-24-7 In Stock
Clobutinol Fumarate Isomer Impurities CS-O-48076 2734472-37-6 Enquire
Dehydro Bisoprolol Hemifumarate Impurities CS-O-07377 1217245-60-7 (Free base) In Stock
Demethoxy Aliskiren Fumarate (2:1) Impurities CS-T-74123 1438401-07-0 Enquire
Diethylaminocarboxymethyl POC Tenofovir Fumarate Impurities CS-EO-03885 2820170-87-2 In Stock
Diisopropyl Tenofovir Fumarate Impurities CS-EO-03884 160616-04-6 (Freebase) Enquire
Diroximel Fumarate-d4 Impurities CS-O-45473 Not Available Enquire
Distearyl Fumarate Impurities CS-O-57258 7283-68-3 Enquire
Eicos-11-Enyl Trimethylsilyl Fumarate Impurities CS-O-57257 Not Available Enquire
Ent-Aliskiren Fumarate (2:1) Impurities CS-T-65291 1630036-76-8 Enquire
Erythromycin Ethyl Fumarate Impurities CS-O-35506 122293-08-7 Enquire
Fesoterodine Aldehyde of Diol Fumarate Impurities CS-EO-03559 214601-12-4 (Freebase) Enquire
Fesoterodine Diol Dimer fumarate Impurities CS-O-48706 Not Available Enquire
FESOTERODINE FUMARATE IMPURITY G Impurities CS-O-49736 1428856-53-4 Enquire
Fesoterodine Fumarate impurity G (fumaric acid ester impurit... Impurities CS-O-35021 1254942-29-4(Free base) Enquire
FESOTERODINE FUMARATE IMPURITY Y Impurities CS-O-35399 Not Available Enquire
Fesoterodine Phenol Aldehyde Fumarate salt Impurities CS-O-49321 214601-12-4 (Freebase) Enquire
Fesoterodine Related Impurity 3 Fumarate Impurities CS-EO-03561 1435768-96-9 (Freebase) Enquire
Formoterol EP Impurity A Fumarate Impurities CS-EO-03577 150513-24-9 (Freebase) Enquire
Formoterol Fumarate benzoxazol impurity Impurities CS-O-46225 Not Available Enquire
Formoterol Fumarate Dihydrate EP Impurity I (R,S-isomer) ((R... Impurities CS-P-07947 67346-51-4 Enquire
Formoterol Fumarate Dihydrate EP Impurity I (S,R-isomer) ((S... Impurities CS-P-07950 67346-50-3 Enquire
Formoterol Fumarate dihydrate Impurity Impurities CS-O-34145 477552-93-5 Enquire
Formoterol Fumarate EP Impurity A Impurities CS-O-14073 150513-24-9 In Stock
Formoterol Fumarate EP Impurity B Impurities CS-O-14074 1224588-66-2 In Stock
Formoterol Fumarate EP Impurity C Impurities CS-O-14075 Not Available Enquire
Formoterol Fumarate EP Impurity D Impurities CS-O-14076 1795133-96-8 In Stock
Formoterol Fumarate EP Impurity E Impurities CS-O-14077 1616967-26-0 Enquire
Formoterol Fumarate EP Impurity F Impurities CS-O-14078 1795129-59-7 Enquire
Formoterol Fumarate EP Impurity H Impurities CS-O-14080 Not Available Enquire
Formoterol Fumarate EP Impurity I Impurities CS-T-55025 532414-36-1 Enquire
Formoterol impurity B fumarate salt Impurities CS-DX-00011 1795137-04-0 Enquire
Formoterol impurity C fumarate salt Impurities CS-DX-00012 1795135-62-4 Enquire
Formoterol impurity D fumarate salt Impurities CS-DX-00013 1795133-96-8 (Freebase) Enquire
Formoterol impurity E fumarate salt Impurities CS-DX-00014 1795136-92-3 Enquire
Formoterol impurity F fumarate salt Impurities CS-DX-00015 1795129-60-0 Enquire
Heptadecyl Trimethylsilyl Fumarate Impurities CS-O-57256 Not Available Enquire
IPC-POC PMPA (Fumarate salt) Impurities CS-O-16349 Not Available Enquire
MOC-POC Tenofovir Fumarate Impurities CS-O-48041 1246812-43-0 (Freebase) Enquire
Mono poc-isopropyl-Tenofovir fumarate salt Impurities CS-O-16396 1422284-15-8 Enquire
Mono-POC Methyl Tenofovir Fumarate (Mixture of Diastereomers... Impurities CS-EO-03886 1246812-16-7 (Freebase) Enquire
N-desmethyl N-ethyl vonoprazan fumarate Impurities CS-O-47382 Not Available Enquire
N-Hydroxymethyl Rizatriptan Fumarate Impurities CS-T-56243 1391062-45-5 Enquire
N-Nitroso Sitagliptin Fumarate Adduct Impurities CS-O-44359 Not Available In Stock
nPOC-POC Tenofovir Fumarate Impurities CS-T-93252 1217542-13-6 (Freebase) In Stock
Palbociclib 2-Steryl Fumarate Adduct Impurities CS-O-59259 Not Available Enquire
Palbociclib 3-Steryl Fumarate Adduct Impurities CS-O-59258 Not Available Enquire
Quetiapine EP Impuirty I (Fumarate salt) Impurities CS-EO-03804 2734403-85-9 Enquire
Quetiapine EP Impurity J Fumarate Salt Impurities CS-O-49021 2470243-24-2 Enquire
R-(+)-Bisoprolol Fumarate Impurities CS-T-66876 216309-92-1 Enquire
rac Fesoterodine Fumarate Impurities CS-T-23606 1333234-73-3 Enquire
Sitagliptin Fumarate Adduct Impurities CS-O-16256 2088771-60-0 In Stock
Sodium Stearyl Fumarate(1614705) Impurities CS-EB-02694 4070-80-8 Enquire
Tenofovir Alafenamide Fumarate Impurities CS-ED-01327 1392275-56-7 In Stock
Tenofovir alafenamide monofumarate Impurities CS-O-39804 1422343-76-7 Enquire
Tenofovir Diphenyl HemiFumarate salt Impurities CS-O-50595 Not Available Enquire
Tenofovir Disoproxil (S)-Isomer Fumarate Impurities CS-O-15755 1280130-08-6 (Freebase) In Stock
Tenofovir Disoproxil Fumarate Impurity Impurities CS-EO-00003 1244022-55-6 Enquire
Tenofovir Disoproxil Fumarate USP RC J Impurities CS-EO-03121 1246812-23-6 Enquire
Tenofovir disoproxil impurity L fumarate Impurities CS-O-52968 Not Available In Stock
Tenofovir Ethyl ester fumarate salt impurity Impurities CS-O-58098 Not Available Enquire
Tenofovir impurity C fumarate salt Impurities CS-O-15992 1798422-29-3 Enquire
TenofovirDisoproxil Ethyl fumarate Impurity Impurities CS-O-49741 Not Available Enquire
Trans-2-methyl-5-amino-2,3,3a,12b-tetrahydro-1H-dibenz[2,3:6... Impurities CS-O-34204 1688678-60-5 Enquire


EP Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Bisoprolol fumarate (Y0000812) EP Standards CS-EG-00197 104344-23-2 Enquire
Quetiapine fumarate (Y0001657) EP Standards CS-EG-02068 111974-72-2 Enquire
Rupatadine fumarate (Y0001922) EP Standards CS-EG-00741 182349-12-8 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(-)-Dimenthyl Fumarate Intermediates CS-T-91391 34675-24-6 Enquire
1-(2-Amino-1-phenylethyl)-4-(trifluoromethyl)piperidin-4-OL ... Intermediates CS-ED-08244 1185237-75-5 Enquire
3-Aminopropionitrile Fumarate (2:1) Intermediates CS-T-66597 2079-89-2 Enquire
Aliskiren fumarate Intermediates CS-ED-41089 1196835-68-3 Enquire
Dibutyl fumarate Intermediates CS-EL-08905 105-75-9 Enquire
Diethyl Fumarate Intermediates CS-T-90177 623-91-6 In Stock
Ibutilide Fumarate Intermediates CS-BB-00021 122647-32-9 Enquire
Lauryl fumarate Intermediates CS-ED-27466 10283-72-4 Enquire
Monobutyl fumarate Intermediates CS-O-42592 16062-88-7 Enquire
Monoisopropylfumarate Intermediates CS-DL-00086 7529-87-5 Enquire
Oxotremorine Sesquifumarate Intermediates CS-T-84055 17360-35-9 Enquire
rac-Anatoxin A Fumarate Intermediates CS-T-48183 1219922-30-1 Enquire
Rilpivirine fumarate (2:1) Intermediates CS-EL-00124 877817-88-4 Enquire
Ro 60-0175 fumarate Intermediates CS-T-85132 169675-09-6 Enquire
S-(-)-Bisoprolol Fumarate Intermediates CS-T-66955 99103-03-4 Enquire
S(-)-Cyanopindolol Hemifumarate Salt Intermediates CS-T-85947 874882-72-1 Enquire
t-Butyl methyl fumarate Intermediates CS-T-69663 55556-66-6 Enquire
TC 2559 Difumarate Intermediates CS-T-87134 212332-35-9 Enquire
Thioproperazine Difumarate Intermediates CS-T-87080 123937-18-8 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-(2,5-dioxopyrrolidin-1-yl)ethyl ethyl fumarate Fine Chemicals CS-O-57261 Not Available Enquire
6-(2,5-dichlorophenyl)-1,3,5-triazine-2,4(1H,3H)-diimine fum... Fine Chemicals CS-O-31164 Not Available In Stock
Bis(2-ethylhexyl) Fumarate Fine Chemicals CS-O-49470 141-02-6 Enquire
Diisobutyl fumarate Fine Chemicals CS-ED-02032 7283-69-4 Enquire
Dimethyl fumarate Fine Chemicals CS-O-30572 624-49-7 In Stock
Monoethyl Fumarate Fine Chemicals CS-O-01932 2459-05-4 In Stock