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

Sulfoxide Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"4,4'-Di-N-acetylamino-diphenylsulfoxide-d8" Stable Isotopes CS-T-52366 557794-36-2 Enquire
Albendazole Sulfoxide-d7 Stable Isotopes CS-T-93854 54029-12-8 (Unlabeled) Enquire
Albendazole-d3 Sulfoxide Stable Isotopes CS-O-02843 1448346-38-0 In Stock
Albendazole-d5 sulfoxide Stable Isotopes CS-O-10207 54029-12-8(Unlabeled) Enquire
Aldicarb sulfoxide-[13C2,d3] Stable Isotopes CS-I-00489 1261170-77-7 Enquire
Aldicarb Sulfoxide-13C3 Stable Isotopes CS-T-96275 Not Available Enquire
Aldicarb-d3 Sulfoxide Stable Isotopes CS-T-65153 1795136-36-5 Enquire
Arbidol-d6 Sulfoxide Stable Isotopes CS-T-99374 Not Available Enquire
Biotin sulfoxide 13C5 Stable Isotopes CS-EK-02244 3376-83-8 unlabeled Enquire
Cefadroxil Sulfoxide-d4 Stable Isotopes CS-T-99338 Not Available Enquire
Cimetidine Sulfoxide-d3 Stable Isotopes CS-T-99326 Not Available Enquire
Clindamycin Sulfoxide-13C D3 Stable Isotopes CS-EQ-00268 22431-46-5(unlabelled) Enquire
Demeton-S Sulfoxide-d10 Stable Isotopes CS-T-98992 Not Available Enquire
Demeton-S-methyl Sulfoxide-d6 Stable Isotopes CS-T-95363 301-12-2(Unlabeled) Enquire
Dimethyl Sulfoxide (13C2, 99%) Stable Isotopes CS-T-95701 136321-15-8 Enquire
Lapatinib-d7 Sulfoxide Dihydrochloride Stable Isotopes CS-T-100108 Not Available Enquire
Levomepromazine-D3 Sulfoxide Stable Isotopes CS-T-97353 7606-29-3 (Unlabelled) Enquire
Lincomycin-13C,D3 Sulfoxide Stable Isotopes CS-T-96520 Not Available Enquire
Lurasidone-d8 Sulfoxide Stable Isotopes CS-T-93437 1809325-45-8 (Unlabeled) Enquire
Methiocarb-d3 Sulfoxide Stable Isotopes CS-T-99176 Not Available Enquire
Methionine sulfoxide- D4 Stable Isotopes CS-O-35514 62697-73-8 (Unlabeled) Enquire
Monepantel sulfoxide-D5 Stable Isotopes CS-W-00536 Not Available Enquire
Nizatidine-d3 Sulfoxide Stable Isotopes CS-T-82921 1795136-43-4 Enquire
Penicillin V-β-Sulfoxide D3 Stable Isotopes CS-T-60197 148680-07-3 Enquire
Perazine-d8 Sulfoxide Stable Isotopes CS-T-84432 1246814-60-7 Enquire
Prochlorperazine Sulfoxide D3 Stable Isotopes CS-T-60668 1189943-37-0 Enquire
Promazine-D4 Sulfoxidez Stable Isotopes CS-T-93522 1346605-30-8 Enquire
Promethazine Sulfoxide-d6 Stable Isotopes CS-T-85876 1189892-93-0 Enquire
Protionamide-d5 Sulfoxide Stable Isotopes CS-T-85248 1329568-86-6 Enquire
rac Methotrimeprazine-d6 Sulfoxide Stable Isotopes CS-T-80755 1346601-89-5 Enquire
rac Toltrazuril-d3 Sulfoxide Stable Isotopes CS-T-86264 1346603-43-7 Enquire
S-​Methyl-​L-​cysteine Sulfoxide-d3 Stable Isotopes CS-T-102871 6853-87-8(Unlabelled) Enquire
Saroglitazar Sulfoxide D4 Mg Salt Stable Isotopes CS-O-32962 Not Available Enquire
Saroglitazar Sulfoxide-d4 Stable Isotopes CS-O-16431 Not Available In Stock
Sutezolid sulfoxide D3 Stable Isotopes CS-O-48617 168828-60-2 (Unlabelled) Enquire
Tazarotene Sulfoxide-d8 Stable Isotopes CS-T-99021 Not Available Enquire
Tazarotenic Acid-d8 Sulfoxide Stable Isotopes CS-T-99022 Not Available Enquire
Teneligliptin-d8 Sulfoxide Stable Isotopes CS-T-96778 Not Available Enquire
Thiofanox Sulfoxide-d3 Stable Isotopes CS-T-104073 39184-27-5(unlablled) Enquire
Thioridazine-d3 5-Sulfoxide Stable Isotopes CS-T-44254 1330076-56-6 Enquire
Triclabendazole sulfoxide-D3 Stable Isotopes CS-O-34121 100648-13-3 (Unlabeled) Enquire
Vamidothion-d6 Sulfoxide Stable Isotopes CS-T-98938 Not Available Enquire
Zaltoprofen-d7 Sulfoxide Stable Isotopes CS-T-99052 Not Available Enquire


Metabolites

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Arbidol Sulfoxide Metabolites CS-P-07043 151455-33-3 Enquire
Axitinib Sulfoxide Metabolites CS-O-13261 1347304-18-0 In Stock
Biotin Sulfoxide Metabolites CS-P-00736 23015-53-4 Enquire
Bithionol Sulfoxide Metabolites CS-O-11160 844-26-8 In Stock
Bosentan Sulfoxide Metabolites CS-O-07397 Not Available Enquire
Brexpiprazole sulfoxide Metabolites CS-O-16172 1191900-51-2 In Stock
Cangrelor Sulfoxide Metabolites CS-O-47444 1890216-14-4 Enquire
Cefadroxil Sulfoxide Metabolites CS-P-07404 182290-77-3 Enquire
Cephalexin R-Sulfoxide Metabolites CS-P-07523 52210-38-5 Enquire
Cephalexin S-Sulfoxide Metabolites CS-P-07522 74708-55-7 Enquire
Cevimeline Sulfoxide (RRR) Metabolites CS-O-47104 124751-37-7 Enquire
Cevimeline sulfoxide-1 Metabolites CS-O-14135 124751-36-6 Enquire
Cevimeline sulfoxide-2 Metabolites CS-O-14136 Not Available Enquire
Chlorthiophos-sulfoxide Metabolites CS-W-00459 Not Available Enquire
Clethodim S-Methyl Sulfoxide Metabolites CS-TB-00513 116007-12-6 Enquire
Clindamycin Sulfoxide (Mixture of Isomers) Metabolites CS-O-05845 22431-46-5 In Stock
Demeton-S Sulfoxide Metabolites CS-O-20045 2496-92-6 In Stock
Diltiazem Sulfoxide Metabolites CS-O-32533 370094-12-5 In Stock
Ethionamide Sulfoxide Metabolites CS-O-10311 536-28-7 Enquire
Famotidine Sulfoxide Metabolites CS-T-16886 90237-03-9 In Stock
Lamivudine Sulfoxide Metabolites CS-EO-00142 1235712-40-9 In Stock
Monepantel sulfoxide Metabolites CS-W-00118 851976-72-2 Enquire
N-Desmethyl Diltiazem Sulfoxide Metabolites CS-O-46915 Not Available In Stock
Pantoprazole Sulfoxide N-Oxide Metabolites CS-O-14408 Not Available In Stock
Phorate Oxon Sulfoxide Metabolites CS-T-93850 2588-05-8 Enquire
Prochlorperazine Sulfoxide Metabolites CS-T-40535 10078-27-0 In Stock
Prochlorperazine Sulfoxide-d8 Metabolites CS-B-00346 Not Available Enquire
Promethazine Sulfoxide Metabolites CS-O-10037 7640-51-9 In Stock
Protionamide Sulfoxide Metabolites CS-O-05890 62178-61-4 In Stock
Sulfoxide,N-oxide - Lurbinectedin Metabolites CS-O-45120 Not Available Enquire
Sutezolid sulfoxide Metabolites CS-O-48616 168828-60-2 Enquire
Teneligliptin Sulfoxide Metabolites CS-O-38508 2478551-43-6 Enquire
Toltrazuril sulfoxide Metabolites CS-W-00251 69004-15-5 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"D,L-Buthionine Sulfoxide" Impurities CS-T-09237 98487-33-3 Enquire
(-)-Biotin Sulfoxide Impurities CS-T-49115 3376-83-8 Enquire
(+)-Biotin (+)-Sulfoxide Impurities CS-T-49116 10406-89-0 Enquire
(4R)-Perillyl Phenyl Sulfoxide Impurities CS-T-39090 1246812-26-9 Enquire
(S)-Dimethenamid Hydroxycysteine Sulfoxide impurity Impurities CS-O-47002 Not Available Enquire
4'-oxideprochlorperazine sulfoxide Impurities CS-ED-00762 879495-68-8 Enquire
5-Hydroxy-clethodim Sulfoxide Impurities CS-T-26991 111031-08-4 Enquire
7-ADCA sulfoxide Impurities CS-O-38337 131722-58-2 Enquire
Albendazole sulfoxide Impurities CS-W-00068 54029-12-8 Enquire
Canagliflozin DIsulfOXIDE impurity Impurities CS-O-42767 Not Available Enquire
Capravirine Sulfoxide Impurities CS-O-13108 216316-63-1 Enquire
Carbetocin sulfoxide II Impurities CS-O-41241 221464-33-1 In Stock
Carbocisteine Sulfoxide (Mixture of diastereomers) Impurities CS-T-10465 5439-87-2 In Stock
Cefadroxil R-Sulfoxide Impurities CS-O-53214 Not Available Enquire
Cefadroxil S-Sulfoxide Impurities CS-O-53213 Not Available Enquire
Cefdinir Sulfoxide Impurities CS-T-10739 934986-48-8 Enquire
Cefixime Sulfoxide Impurities CS-P-08167 Not Available In Stock
Cefpodoxime Proxetil sulfoxide Impurities CS-O-13519 Not Available Enquire
Cephalexin Sulfoxide Impurities CS-T-50480 56193-21-6 Enquire
Cis Cevimeline Sulfoxide Impurities CS-O-47930 Not Available Enquire
Clethodim Sulfoxide Impurities CS-T-13088 111031-14-2 Enquire
Clindamycin 2-Phosphate Sulfoxide Impurities CS-T-51185 1228573-90-7 In Stock
Clindamycin 2-Phosphate Sulfoxide Isomer A Impurities CS-O-33317 887402-20-2 Enquire
Clindamycin 2-Phosphate Sulfoxide Isomer B Impurities CS-O-33318 887402-21-3 Enquire
Clindamycin Palmitate Sulfoxide Impurities CS-T-51184 1123211-65-3 In Stock
Clindamycin Sulfoxide (R-Isomer) Impurities CS-O-45065 887607-53-6 Enquire
Clindamycin Sulfoxide (S-Isomer) Impurities CS-O-45066 887607-49-0 Enquire
Clindamycin Sulfoxide palmitate isomer Impurities CS-O-35317 Not Available Enquire
Clindamycin Sulfoxide palmitate isomer 2 Impurities CS-O-35318 Not Available Enquire
Cosyntropin sulfoxide Impurities CS-O-43972 62673-38-5 Enquire
Deacylated sulfoxide - Lurbinectedin Impurities CS-O-45121 Not Available Enquire
Desmopressin Sulfoxide Impurities CS-P-01279 Not Available Enquire
Desmopressin Sulfoxide-I Impurities CS-O-43054 Not Available Enquire
Desmopressin Sulfoxide-II Impurities CS-O-43055 Not Available Enquire
Desmopressin Sulfoxide-III Impurities CS-O-43052 Not Available Enquire
Desmopressin Sulfoxide-IV Impurities CS-O-43053 Not Available Enquire
Desulfoxide 4-Demethyl Omeprazole Impurities CS-T-88918 1384163-92-1 Enquire
Dimethyl Disulfoxide Impurities CS-P-08726 98984-65-7 Enquire
Dimethyl Sulfoxide D Solution Impurities CS-O-43798 67-68-5 Enquire
Dimethyl Sulfoxide D6 40% solution in D2O Impurities CS-O-44175 2206-27-1 Enquire
Dothiepin Sulfoxide ( E-isomer) Impurities CS-O-46691 42046-35-5 Enquire
Ethylphenylsulfoxide Impurities CS-T-77153 4170-80-3 Enquire
Fenbendazole-Amine Sulfoxide Impurities CS-T-75006 69489-26-5 In Stock
Fluphenazine Sulfoxide Impurities CS-T-54965 1674-76-6 In Stock
Impurity (sulfoxide) Impurities CS-O-30385 120-62-7 Enquire
L-Buthionine Sulfoxide Impurities CS-T-09236 199982-01-9 Enquire
Lincomycin Sulfoxide Impurities CS-T-95954 22083-92-7 Enquire
L-Methionine Sulfoxide Impurities CS-T-57600 3226-65-1 In Stock
Methiocarb Sulfoxide Impurities CS-T-32129 Not Available Enquire
Methyl Benzyl Sulfoxide Impurities CS-T-33291 824-86-2 Enquire
Metopimazine Sulfoxide Impurities CS-T-35569 18181-99-2 In Stock
Mono Sulfoxide Sugammadex Impurities CS-O-16540 Not Available Enquire
Mono-sulfoxide-Sugammadex Epimer I Impurities CS-O-32912 2412953-11-6 In Stock
Mono-sulfoxide-Sugammadex Epimer II Impurities CS-O-32913 2412953-12-7 In Stock
N-Desmethyl Levomepromazine sulfoxide Impurities CS-O-35072 16808-77-8 Enquire
N-Desmethyl Trimeprazine Sulfoxide Impurities CS-T-89134 102416-02-4 Enquire
N-Nitroso Vortioxetine Sulfoxide Impurities CS-EO-02730 Not Available In Stock
o-Chlorobenzyl Methyl Sulfoxide Impurities CS-T-72918 23413-66-3 Enquire
Perazine Sulfoxide Impurities CS-T-39055 20627-44-5 Enquire
Phenothiazine Sulfoxide Impurities CS-ED-42021 1207-71-2 Enquire
Phorate sulfoxide Impurities CS-T-60523 2588-03-6 In Stock
Piperacillin Sulfoxide Impurities CS-O-59498 Not Available Enquire
Promethazine Sulfoxide N-Oxide Hydrochloride Impurities CS-T-94177 1135334-50-7 Enquire
Quetiapine Sulfoxide Impurities CS-O-10314 329216-63-9 In Stock
Rivaroxaban Sulfoxide Impurities CS-O-35646 2197189-38-9 Enquire
S-Sulindac Sulfoxide Impurities CS-T-61529 149116-77-8 Enquire
Sugammadex Diastereomer 1 Sulfoxide Sodium Salt Impurities CS-O-56856 2412953-13-8 Enquire
Sugammadex Diastereomer 2 Sulfoxide Impurities CS-EO-00668 2412953-12-7 Enquire
Sugammadex Diastereomer 2 Sulfoxide Sodium Salt Impurities CS-O-56854 2412953-14-9 Enquire
Sugammadex Disulfoxide Impurity Impurities CS-O-32980 Not Available Enquire
Sugammadex Octa disulfoxide Impurities CS-O-32905 Not Available Enquire
Sugammadex Octa sulfoxide Impurities CS-O-32904 Not Available Enquire
Sugammadex octasulfoxide Impurities CS-O-49187 1202448-71-2 Enquire
Sugammadex Sulfoxide Impurity Impurities CS-O-55984 2411298-90-1 Enquire
Sulfoxide - Lurbinectedin Impurities CS-O-45118 Not Available Enquire
Tazarotene Sulfoxide Impurities CS-T-43204 864841-56-5 In Stock
Teneligliptin (R) Sulfoxide Impurities CS-O-54922 Not Available Enquire
Teneligliptin Sulfoxide Hydrochloride Impurities CS-O-49058 2478551-43-6 (Freebase) Enquire
Thiothixene Sulfoxide Impurities CS-O-56585 47681-53-8 Enquire
Ticagrelor Sulfoxide Diastereoisomer-I Impurities CS-O-34125 Not Available Enquire
Ticagrelor Sulfoxide Diastereoisomer-II Impurities CS-O-34126 Not Available Enquire
Trametinib Dimethyl Sulfoxide Impurities CS-O-15521 1187431-43-1 In Stock
Trans Cevimeline Sulfoxide Impurities CS-O-47931 Not Available Enquire
Triclabendazole Sulfoxide Impurities CS-W-00076 100648-13-3 In Stock
Trimeprazine Sulfoxide Impurities CS-ED-00811 10071-07-5 In Stock
Vamidothion Sulfoxide Impurities CS-T-62757 20300-00-9 Enquire
Vortioxetine Sulfoxide Hydrochloride Impurities CS-O-49449 2236051-10-6 Enquire
α-Chloroethyl Phenyl Sulfoxide Impurities CS-T-69469 26910-40-7 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"2-chlorophenyl 4-methyl-1,2,3-thiadiazol-5-yl sulfoxide" Intermediates CS-EL-30223 339008-92-3 Enquire
"4-chlorobenzyl 5-[(1-naphthyloxy)methyl]-4-phenyl-4H-1,2,4-... Intermediates CS-EL-19343 956148-54-2 Enquire
"4-chlorophenyl 4-methyl-1,2,3-thiadiazol-5-yl sulfoxide" Intermediates CS-EL-07604 282523-01-7 Enquire
"4-fluorophenyl 4-methyl-1,2,3-thiadiazol-5-yl sulfoxide" Intermediates CS-EL-10609 282523-03-9 Enquire
"cyclohexyl 1,2,3-thiadiazol-5-yl sulfoxide" Intermediates CS-EL-29829 338759-82-3 Enquire
(R)-Methyl-p-tolylsulfoxide Intermediates CS-CP-00015 1519-39-7 Enquire
(R)-O-Anisyl phenyl sulfoxide Intermediates CS-ED-11335 60301-04-4 Enquire
(S)-carboxymethyl-L-cysteine sulfoxide Intermediates CS-DH-00014 20960-90-1 Enquire
2-(1-Hydroxyethyl) Promazine Sulfoxide Intermediates CS-T-56041 73644-42-5 Enquire
2-Hydroxyethyloctylsulfoxide Intermediates CS-AX-00168 7305-30-8 Enquire
4-Benzoylphenyl methyl sulfoxide Intermediates CS-ED-13770 73241-57-3 Enquire
4-chlorophenyl 6-(methoxymethyl)-2-methyl-4-pyrimidinyl sulf... Intermediates CS-EL-13202 338747-92-5 Enquire
Carbophenothion Sulfoxide Intermediates CS-T-50296 17297-40-4 Enquire
Cevimeline Sulfoxide Intermediates CS-T-50501 124751-36-6 Enquire
Chlorprothixene Sulfoxide Oxalate Intermediates CS-T-72607 1391062-41-1 Enquire
Cyamemazine Sulfoxide Intermediates CS-T-91473 13384-45-7 Enquire
Demeton-S-methyl Sulfoxide Intermediates CS-T-15226 301-12-2 Enquire
Diphenyl sulfoxide Intermediates CS-M-57844 945-51-7 Enquire
Fenbendazole Sulfoxide Intermediates CS-T-23478 53716-50-0 Enquire
GW 501516 Sulfoxide Intermediates CS-T-79539 1206891-26-0 Enquire
Promazine Sulfoxide Intermediates CS-T-85230 146-21-4 Enquire
rac Methotrimeprazine Sulfoxide Intermediates CS-T-57612 7606-29-3 Enquire
S-Methyl-N,N-diethyldithiocarbamate Sulfoxide Intermediates CS-T-33605 145195-14-8 Enquire
Tazarotenic Acid Sulfoxide Intermediates CS-T-43198 603952-64-3 Enquire
Zileuton Sulfoxide Intermediates CS-T-46758 1147524-83-1 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Methylphenothiazine Sulfoxide Fine Chemicals CS-O-58096 2234-09-5 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Dimethyl Sulfoxide LR Grade Building Blocks CS-T-20619 67-68-5 In Stock
trans-2,3-Diphenylcyclopropylmethyl Phenyl Sulfide Sulfoxide Building Blocks CS-TB-34921 131758-71-9 Enquire


Pesticide Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Aldicarb Sulfoxide Pesticide Standards CS-T-01556 1646-87-3 Enquire
Butocarboxim-sulfoxide Pesticide Standards CS-AZ-00093 34681-24-8 Enquire
Chlorbenside-sulfoxide Pesticide Standards CS-AZ-00103 7047-28-1 Enquire
Cyclopentylalbendazole sulfoxide Pesticide Standards CS-W-00079 131454-43-8 Enquire
Ethiofencarβ-sulfoxide Pesticide Standards CS-AZ-00161 53380-22-6 Enquire
Fenamiphos Sulfoxide Pesticide Standards CS-T-23471 31972-43-7 Enquire
Fenthion Sulfoxide Pesticide Standards CS-T-23571 3761-41-9 Enquire
Fenthoxon Sulfoxide Pesticide Standards CS-T-23577 6552-13-2 Enquire
Flufenacet-thioglycolate sulfoxide Pesticide Standards CS-BX-00589 201668-33-9 Enquire
Terbufos-sulfoxide Pesticide Standards CS-T-87181 10548-10-4 Enquire
Terbufoxon Sulfoxide Pesticide Standards CS-T-86806 56165-57-2 Enquire
Thiofanox Sulfoxide Pesticide Standards CS-T-86926 39184-27-5 Enquire
Thiometon Sulfoxide Pesticide Standards CS-T-86846 2703-37-9 In Stock