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

Sulfonic Acid Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
[2,3,4-13C3]-Perfluorobutane sulfonic acid Stable Isotopes CS-O-45186 2265893-06-7 Enquire
1,1,1-Trifluoromethanesulfonic Acid 2-(2-Propen-1-yl)phenyl ... Stable Isotopes CS-T-102008 Not Available Enquire
2-(4-Amino-1,3,5-triazin-2-yl)sulfanylethanesulfonic Acid-d4 Stable Isotopes CS-T-99381 1794793-34-2 Enquire
2-(Perfluorohexyl)ethane-1-sulfonic Acid Sodium Salt--13C2 Stable Isotopes CS-T-102901 2708218-89-5 Enquire
2,2'-[Carbonylbis(thio)]bisethanesulfonic Acid-d8 Disodium S... Stable Isotopes CS-T-99339 Not Available Enquire
2-Anthraquinonesulfonic Acid Sodium Salt-d7 Stable Isotopes CS-T-99379 Not Available Enquire
2-Naphthalenesulfonic acid, hydrate-d7 Stable Isotopes CS-O-59244 312623-89-5 Enquire
3-((ethyl(nitroso)amino)methyl)benzenesulfonic acid (D4-Ring... Stable Isotopes CS-O-44282 Not Available Enquire
3-((ethyl-D5(nitroso)amino)methyl)benzenesulfonic acid Stable Isotopes CS-O-44281 Not Available Enquire
3-(Acetylmethylamino)-1-propanesulfonic Acid Calcium Salt-d6 Stable Isotopes CS-T-98755 Not Available Enquire
3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluoro-1-decan... Stable Isotopes CS-T-102902 2708218-90-8 Enquire
4-​Methyl-​benzenesulfonic Acid (2E)​-​[(5R)​-​2-​Methyl-​5-... Stable Isotopes CS-T-102644 510753-48-7(Unlabelled) Enquire
4,4-Dimethyl-4-(silapentane-d6)-1-sulfonic Acid Stable Isotopes CS-TB-39595 284664-85-3 Enquire
4-Chlorobenzenesulfonic Acid-d4 Sodium Salt Stable Isotopes CS-T-102403 2514953-11-6 Enquire
4-Hydroxybenzenesulfonic Acid-13C6 Stable Isotopes CS-T-103123 98-67-9(Unlabelled) Enquire
Dimethachlor Ethane Sulfonic Acid Sodium Salt-d6 Stable Isotopes CS-T-96244 Not Available Enquire
METHANESULFONIC ACID D4 Stable Isotopes CS-R-00469 203578-15-8 Enquire
O-Desethyl Resiquimod-d6 p-Toluenesulfonic Acid Salt Stable Isotopes CS-T-102539 Not Available Enquire
Perfluorooctane sulfonic acid 13C8 Stable Isotopes CS-O-45182 2265893-05-6 Enquire
Perfluorooctylsulfonic Acid-13C8 50 μg/mL in Methanol Stable Isotopes CS-O-47216 2265893-05-6 Enquire
trans-Clopenthixol-d4 (-)-10-Camphorsulfonic Acid Salt Stable Isotopes CS-T-99324 Not Available Enquire
Zuclopenthixol-d4 (-)-10-Camphorsulfonic Acid Salt Stable Isotopes CS-T-99045 Not Available Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-(N-Morpholino)propanesulfonic acid API CS-AR-00300 1132-61-2 Enquire


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
8-sulfonic acid apomorphine Metabolite CS-O-45574 1145912-09-9 Enquire
Benzenesulfonic Acid Isopropyl Ester Metabolite CS-O-07355 6214-18-2 In Stock


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(-)-Camphorsulfonic Acid Methyl Ester Impurity CS-O-45431 83603-04-7 Enquire
(2R,3S)-Efinaconazole p-Toluenesulfonic acid Impurity CS-O-44979 Not Available Enquire
(E)-7-Hydroxy-3,3'-dioxo-[2,2'-biindolinylidene]-5,5'-disulf... Impurity CS-O-59162 ---- Enquire
(S)-Dimethenamid ethane sulfonic acid 2-carboxylic acid impu... Impurity CS-O-46998 Not Available Enquire
(S)-Dimethenamid ethane sulfonic acid L-alanine impurity Impurity CS-O-46999 Not Available Enquire
(S)-Dimethenamid-ethane sulfonic acid Impurity CS-O-46995 Not Available Enquire
2-((2,4-dimethylthiophen-3-yl)amino)-2-oxoethane-1-sulfonic ... Impurity CS-O-47005 Not Available Enquire
2-(4,6-Diamino-1,3,5-triazin-2-yl)sulfanylethanesulfonic Aci... Impurity CS-T-88457 1391054-56-0 In Stock
2,2'-Dihydroxy-3,3'-dioxo-[2,2'-biindoline]-5,5'-disulfonic ... Impurity CS-O-59163 786615-03-0 Enquire
2,6-Difluorobenzenesulfonic acid Impurity CS-O-45558 686258-75-3 In Stock
3-Pyridinesulfonic acid Impurity CS-M-57748 636-73-7 Enquire
4-(trifluoromethyl)benzenesulfonic acid Impurity CS-O-54958 109787-11-3 Enquire
4-acetamido-3-methylbenzenesulfonic acid, sodium salt Impurity CS-O-45635 102568-34-3 Enquire
4-Oxo Gemifloxacin methanesulfonic acid salt Impurity CS-O-49008 284474-31-3 (Freebase) Enquire
5-Hydroxytoluene-2,4-disulfonic Acid Impurity CS-O-60996 15509-33-8 Enquire
6,6 -Oxybis-2-naphthalenesulfonic Acid Disodium Salt Impurity CS-T-38394 61551-82-4 Enquire
6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfoni... Impurity CS-O-43346 Not Available Enquire
Benzenesulfonic Acid Ethyl Ester Impurity CS-O-07354 515-46-8 In Stock
Benzylidene Camphor Sulfonic Acid Impurity CS-ED-42348 56039-58-8 Enquire
Desmethoxyamino Hydroxy Gemifloxacin methanesulfonic acid Impurity CS-O-49006 213672-25-4 (Freebase) Enquire
Epinephrine 5- benzenesulfonic acid Impurity CS-O-51550 2469755-95-9 Enquire
Epinephrine 6-benzenesulfonic acid Impurity CS-O-51551 2731964-60-4 Enquire
Epinephrine Sulfonic acid sodium salt Impurity CS-O-54361 Not Available In Stock
m-Cresol-4-Sulfonic Acid Ammonium Impurity CS-O-14027 ---- In Stock
R-Apomorphine-8-Sulfonic Acid Impurity CS-O-46786 Not Available Enquire
Tamsulosin Sulfonic Acid Impurity CS-T-43135 890708-67-5 In Stock
Thiosulfonic Acid Bindschedler Green Impurity CS-O-37671 15967-15-4 In Stock
Vasopressin Di-Sulfonic Acid Impurity Impurity CS-O-56796 ---- Enquire
(2,3,3-trimethyl-3H-indole-5-sulfonic acid) Impurity CS-O-36460 132557-72-3 Enquire
(4-Nitrophenyl) methanesulfonic acid Impurity CS-O-40214 53992-33-9 Enquire
(S)-Rasagiline Ethanesulfonic acid Impurity CS-T-85528 202464-89-9 Enquire
2,2-Bis-[3-(1-methylpiperidin-4-yl)-1H-indol-5-yl]ethanesulf... Impurity CS-T-66943 1346604-16-7 Enquire
2-[[(Guanidino)(imino)methyl]sulfanyl]ethanesulfonic Acid Impurity CS-T-79389 1391053-66-9 Enquire
2-amino-4-chloro-5-sulfamoylbenzenesulfonic acid Impurity CS-O-41337 Not Available Enquire
3-Amino-Benzenesulfonic Acid Ethyl Ester Impurity CS-P-08657 1071394-78-9 Enquire
4-Amino-3-chloro-5-methyl-benzenesulfonic acid Impurity CS-O-38192 6387-14-0 Enquire
4-Hydroxybenzenesulfonic acid Impurity CS-DV-02821 98-67-9 Enquire
5-(2-amino-1-hydroxyethyl)-2,3-dihydroxybenzenesulfonic acid Impurity CS-O-36355 Not Available Enquire
Demethylpiperazinyl 7-Desoxo 7-Thioxosildenafil Sulfonic Aci... Impurity CS-T-15198 1353018-10-6 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,2-Benzisoxazole-3-methanesulfonic acid sodium salt Intermediate CS-O-30841 73101-64-1 In Stock
1-Hexane sulfonic acid sodium salt for ion pair chromatograp... Intermediate CS-CG-00015 2832-45-3 In Stock
2-(4-Morpholinyl)-1-ethanesulfonic acid Intermediate CS-M-16376 4432-31-9 In Stock
2-Hydroxy-3-mercapto-5-(tert-pentyl)benzenesulfonic acid Intermediate CS-O-57522 ---- Enquire
4-Amino-5-methoxy-2-methylbenzenesulfonic Acid Intermediate CS-T-02878 6471-78-9 In Stock
5-Amino-1-naphthalenesulfonic Acid Intermediate CS-T-03115 84-89-9 In Stock
Butane-1,4-disulfonic Acid Disodium Salt Intermediate CS-T-49964 36589-61-4 In Stock
Pentafluoroethane sulfonic acid Intermediate CS-BX-02699 354-88-1 Enquire
Undecafluoropentanesulfonic Acid Intermediate CS-T-87986 2706-91-4 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,1,2,2,3,3,4,4,5,5,5-Undecafluoro-1-pentanesulfonic Acid So... Fine Chemicals CS-T-84397 630402-22-1 Enquire
1,3-Benzenedisulfonic acid Fine Chemicals CS-O-54123 98-48-6 Enquire
11-Chloroperfluoro-3-oxaundecanesulfonic acid Fine Chemicals CS-O-49816 763051-92-9 Enquire
1-Butanesulfonic acid sodium Fine Chemicals CS-DA-00237 2386-54-1 In Stock
1H,1H,2H,2H-Perfluorodecanesulfonic acid Fine Chemicals CS-ED-00474 39108-34-4 In Stock
1H-Benzimidazole-2-sulfonic acid Fine Chemicals CS-O-08044 40828-54-4 In Stock
1-Heptanesulfonic acid sodium salt Fine Chemicals CS-BL-00001 22767-50-6 Enquire
1-Octanesulfonic acid sodium Fine Chemicals CS-DA-00238 5324-84-5 In Stock
1-Pentanesulfonic Acid Sodium Fine Chemicals CS-DA-00287 207605-40-1 In Stock
1-Propanesulfonic Acid Sodium Salt Fine Chemicals CS-O-54475 14533-63-2 Enquire
2-(isopropylaminocarbonyl) phenylaminosulfonic acid Fine Chemicals CS-O-58651 68289-11-2 Enquire
2-(Perfluorohexyl)ethane-1-Sulfonic Acid Fine Chemicals CS-T-39064 27619-97-2 In Stock
2-(Perfluorohexyl)ethane-1-sulfonic Acid Sodium Salt Fine Chemicals CS-T-84577 27619-94-9 Enquire
2,4,6-Trinitrobenzenesulfonic acid Fine Chemicals CS-DV-01267 2508-19-2 In Stock
2-Cyanoethanesulfonic acid Fine Chemicals CS-O-53042 107-67-5 Enquire
2-Mercaptoethanesulfonic acid Fine Chemicals CS-O-53337 3375-50-6 Enquire
3,3'-dioxo-2,2'-bi-indolylidene-5-sulfonic acid Fine Chemicals CS-O-35042 605-18-5 Enquire
3-[(Ethylamino)methyl]benzenesulfonic acid Fine Chemicals CS-O-58654 25938-58-3 Enquire
4-hydroxy-butane-1-sulfonic acid Fine Chemicals CS-O-13870 26978-64-3 In Stock
4-methylbenzenesulfonic acid Fine Chemicals CS-BX-01316 104-15-4 Enquire
7-Hydroxy-1,3,6-naphthalenetrisulfonic acid Fine Chemicals CS-O-53871 ---- Enquire
Ethanesulfonic acid Fine Chemicals CS-BX-02887 594-45-6 Enquire
Hydroxylamine-O-sulfonic acid Fine Chemicals CS-M-57514 2950-43-8 In Stock
o-Cresolsulfonic acid Fine Chemicals CS-ED-41858 7134-04-5 Enquire
Perfluoro(2-((6-chlorohexyl)oxy)ethanesulfonic acid) Fine Chemicals CS-ED-41960 756426-58-1 Enquire
Perfluoroheptanesulfonic Acid Sodium Salt Fine Chemicals CS-O-55149 21934-50-9 Enquire
Perfluorohexadecanesulfonic acid Fine Chemicals CS-O-59769 81735-29-7 Enquire
Perfluorohexane Sulfonic Acid Fine Chemicals CS-ED-00324 355-46-4 In Stock
Perfluorooctadecanesulfonic acid Fine Chemicals CS-O-59770 51604-60-5 Enquire
Perfluorooctanesulfonic acid Fine Chemicals CS-MM-12866 1763-23-1 In Stock
Perfluorotetradecanesulfonic acid Fine Chemicals CS-O-59768 1379460-39-5 Enquire
Trifluoromethanesulfonic Acid Fine Chemicals CS-O-30811 1493-13-6 Enquire
2-(Methoxy Carbonyl)benzene sulfonic acid Fine Chemicals CS-O-37087 57897-77-5 Enquire
2-(Piperidin-4-yl)ethane-1-sulfonic acid Fine Chemicals CS-ZB-36666 4944-21-2 Enquire
2,3-dihydroxy-6-[(1r)-1-hydroxy-2-(methylamino)ethyl]benzene... Fine Chemicals CS-O-38206 Not Available Enquire
2-Amino-5-chlorobenzene-1,3-disulfonic acid Fine Chemicals CS-ED-02041 950-60-7 Enquire
3-hydroxy-4-[(2-Methoxy-5-methyl-4-sulfophenyl)azo]-2,7-Naph... Fine Chemicals CS-RS-00128 61660-30-8 Enquire
4-(Acetylamino)-3-methylbenzenesulfonic acid Fine Chemicals CS-O-36599 76382-58-6 Enquire
4,4'-(Diazoamino)dibenzenesulfonic acid Fine Chemicals CS-ED-01351 17596-06-4 Enquire
4,5-Dihydro-1H-imidazole-2-sulfonic acid Fine Chemicals CS-ED-01843 64205-92-1 Enquire
4-acetamido-3-chloro-5-methylbenzenesulfonic acid Fine Chemicals CS-O-36600 408508-13-4 Enquire
4-Diazobenzenesulfonic acid Fine Chemicals CS-MM-49711 305-80-6 Enquire
4-Tert-butylbenzenesulfonic acid Fine Chemicals CS-BX-00793 1133-17-1 Enquire
8-Anilino-1-naphthalenesulfonic Acid Ammonium Salt Fine Chemicals CS-T-66189 28836-03-5 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-((4-(ethyl(nitroso)amino)phenyl)(4-(ethylamino)phenyl)meth... Nitrosamine CS-O-54775 ---- Enquire
2-(4-nitrosopiperazin-1-yl)ethane-1-sulfonic acid Nitrosamine CS-O-60207 ---- Enquire
2-(bis(4-(ethyl(nitroso)amino)phenyl)methyl)benzene-1,4-disu... Nitrosamine CS-O-54776 ---- Enquire
N-Nitroso Venetoclax sulfonic acid Impurity Nitrosamine CS-O-51232 ---- Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Amidosulfonic Acid-15N Stable Isotope Reagent CS-T-103095 5329-14-6(Unlabelled) Enquire
Methanesulfonic acid-D Stable Isotope Reagent CS-O-52421 66178-40-3 Enquire
p-Toluene-d7 -sulfonic Acid H O Stable Isotope Reagent CS-C-01703 1219795-22-8 Enquire
Trifluoromethanesulfonic acid-d Stable Isotope Reagent CS-O-42176 66178-41-4 In Stock


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2,4-dinitrobenzenesulfonic acid Building Blocks CS-T-102299 89-02-1 Enquire
2-Diazo-1-naphthol-5-sulfonic Acid Sodium Salt Building Blocks CS-T-102303 2657-00-3 Enquire
3-Pentanesulfonic acid Building Blocks CS-O-48247 51650-30-7 Enquire
4-((2-chloro-4-hydroxyphenyl)diazenyl)benzenesulfonic acid Building Blocks CS-T-94537 253801-34-2 Enquire
4-[Ethyl(3-methylphenyl)amino]-1-butanesulfonic acid Building Blocks CS-O-48036 127531-29-7 Enquire
4-Aminopyridine-3-sulfonic acid Building Blocks CS-O-47138 29452-57-1 Enquire
5-(1,1-Dimethylpropyl)-2-hydroxybenzenesulfonic acid Building Blocks CS-O-57521 752958-44-4 Enquire
8-Aminonaphthalene-1,3,5-trisulfonic acid Building Blocks CS-O-50107 17894-99-4 Enquire
Diazobenzenesulfonic acid Building Blocks CS-ED-41468 2154-66-7 Enquire
Perfluoro-3-oxapentane-sulfonic acid Building Blocks CS-ED-42153 113507-82-7 Enquire
Trifluoro methane sulfonic acid tert amyl ester Building Blocks CS-O-46745 Not Available Enquire
1-Amino-8-naphthol-4-sulfonic Acid Building Blocks CS-T-66259 83-64-7 Enquire
1-Hexanesulfonic acid sodium salt monohydrate Building Blocks CS-DA-00286 207300-91-2 Enquire
4-(bromomethyl)benzenesulfonic acid Building Blocks CS-ED-01233 82835-61-8 Enquire
Isatin-5-sulfonic acid sodium salt dihydrate Building Blocks CS-T-95898 207399-16-4 Enquire
Perfluorbutane-1-sulfonic acid 100µg/ml in acetonitrile Building Blocks CS-O-44063 375-73-5 Enquire
Perfluordodecane-1- sulfonic acid 100µg/ml in acetonitrile Building Blocks CS-O-44066 79780-39-5 Enquire
Perfluornonane -1-sulfonic acid 100µg/ml in acetonitrile Building Blocks CS-O-44064 68259-12-1 Enquire
perfluorononanesulfonic acid Building Blocks CS-ED-01671 68259-12-1 Enquire
Perfluorotridecane sulfonic acid Building Blocks CS-O-36511 791563-89-8 Enquire
Perfluoroundecane sulfonic acid Building Blocks CS-ED-01242 749786-16-1 Enquire
Perfluortridecane-1-sulfonic acid 100µg/ml in acetonitrile Building Blocks CS-O-44067 791563-89-8 Enquire
Perfluorundecane-1-sulfonic acid 100µg/ml in acetonitrile Building Blocks CS-O-44065 749786-16-1 Enquire


Carbohydrates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(3R,4S,5S,6R)-2-(5-carboxypentyloxy)-3,5-diacetoxy-6-(acetox... Carbohydrates CS-O-55524 ---- Enquire


Catalyst

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Al(III) Phthalocyanine chloride disulfonic acid Catalyst CS-O-49130 1451075-54-9 Enquire