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

Pyrazolo Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(R)-3-(4-Phenoxyphenyl)-1-(piperidin-3-yl)-1H-pyrazolo[3,4-d... Stable Isotopes CS-T-98817 Not Available Enquire
1-((R)-3-(4-Amino-3-(4-(phenoxy-D5)phenyl)-1H-pyrazolo[3,4-d... Stable Isotopes CS-EO-02393 2068022-09-1 Enquire
2-(2-Chlorophenyl)-4-(3-(dimethylamino)phenyl)-5-methyl-1H-p... Stable Isotopes CS-T-100637 Not Available Enquire
4,6-Dimethoxy-1H-pyrazolo[3,4-d]pyrimidine-13C,15N2 Stable Isotopes CS-T-100416 Not Available Enquire
Pyrazolosalicyloyl Imide-d3 Stable Isotopes CS-T-102098 Not Available Enquire
6-Bromo-3-(1-methyl-1H-pyrazol-4-yl)-5-(3R)-3-piperidinylpyr... Stable Isotopes CS-T-100966 Not Available Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(R)-N-(5-(2-(2,5-difluorophenyl) pyrrolidin-1-yl)pyrazolo[1,... Impurity CS-O-60585 ---- Enquire
2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]pyrimid... Impurity CS-T-74988 428854-24-4 In Stock
3-(3,4-Dichlorophenyl)-5-[3-(3-pyridinyl)phenyl]-2-(trifluor... Impurity CS-O-52228 1832592-68-3 Enquire
3-(4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1... Impurity CS-O-35292 ---- Enquire
5-Fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-car... Impurity CS-O-40932 1350653-26-7 Enquire
7-chloro-5-propylpyrazolo[1,5-a]pyrimidine Impurity CS-O-48883 244127-41-1 In Stock
Bis (6,7-dihydro-5H-pyrazolol[1,2,4] triazolium-6-yl) disulp... Impurity CS-O-45030 141499-33-4 Enquire
Bispyrazolone Impurity CS-T-07241 7477-67-0 In Stock
ethyl 6-chloro-5,7-dimethylpyrazolo[1,5-a]pyrimidine-3-carbo... Impurity CS-O-48894 1035835-21-2 In Stock
pinoxaden 9-amino-1,2,4,5-tetrahydro-pyrazolo-[1,2-d][1,4,5]... Impurity CS-O-48773 Not Available Enquire
Pyrazolo Minocycline Impurity CS-T-60908 182004-72-4 In Stock
Pyrazolo Minocycline hydrochloride Impurity CS-O-46963 1402209-08-8 Enquire
(1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)... Impurity CS-O-39331 Not Available Enquire
(2S,3R)-4-((6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazol-4-i... Impurity CS-O-37666 Not Available Enquire
(3S)-N-(5-Chloropyrazolo[1,5-a]pyrimidin-3-yl)-3-hydroxy-1-p... Impurity CS-O-39034 2226370-52-9 Enquire
(R)-1-(3-(3-(4-phenoxyphenyl)-4-((triphenyl-l5-phosphaneylid... Impurity CS-O-37346 2064175-44-4 Enquire
(R)-N-(3-(4-phenoxyphenyl)-1-(piperidin-3-yl)-1Hpyrazolo[ Impurity CS-O-37344 2064175-43-3 Enquire
[3-(2-Methylpyrazolo[1,5-a]pyrimidin-7-yl)benzyl]-amine hydr... Impurity CS-M-29052 1185294-93-2 Enquire
1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carbonitrile Impurity CS-DL-00546 256376-65-5 Enquire
1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboximidam... Impurity CS-T-74437 256499-19-1 Enquire
1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxylic a... Impurity CS-DL-00545 256376-59-7 Enquire
1-(4-methoxyphenyl)-7a-morpholino-7-oxo-6-(4-(2-oxopiperidin... Impurity CS-O-39330 Not Available Enquire
1-(tert-butyl)-3-phenyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine Impurity CS-O-38782 180903-16-6 Enquire
1,2,4,5,6,7-Hexahydropyrazolo[3,4-c]pyridin-3-one hydrochlor... Impurity CS-M-53262 1187830-91-6 Enquire
1,3,6-Trimethyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid Impurity CS-M-23345 886503-44-2 Enquire
1-[(2-fluorophenyl)methyl]-3-iodo-1H-pyrazolo[3,4-b]pyridine Impurity CS-EM-01686 1313738-72-5 Enquire
1H-Pyrazolo[3,4-b]pyridin-3-amine Impurity CS-M-16791 6752-16-5 Enquire
1H-Pyrazolo[3,4-b]pyridine-3-carboxylic acid Impurity CS-M-29088 116855-08-4 Enquire
1H-Pyrazolo[3,4-b]pyridine-3-diazonium Tetrafluoroborate(1-) Impurity CS-T-60909 63682-46-2 Enquire
1-Isopropyl-1H-pyrazolo[3,4-b]pyridin-5-amine Impurity CS-T-30029 872103-27-0 Enquire
1-Isopropyl-6-methyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic... Impurity CS-M-10853 883544-72-7 Enquire
1-methyl-5-(5-(4-phenylpiperazine-1-carbonyl)-2-propoxypheny... Impurity CS-O-39281 Not Available Enquire
2-(1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-5-(phe... Impurity CS-T-75275 428854-23-3 Enquire
2-(Cyanomethyl)-5,7-bis(trifluoromethyl)pyrazolo-[1,5-a]pyri... Impurity CS-M-32310 338786-45-1 Enquire
2-(methylsulfanyl)-1H,4H-pyrazolo[1,5-a][1,3,5]triazin-4-one Impurity CS-EM-02747 54346-18-8 Enquire
2,5-Dimethylpyrazolo[1,5-a]pyrimidin-7-amine Impurity CS-M-47201 2369-89-3 Enquire
2-Methyl-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid Impurity CS-M-07693 96319-38-9 Enquire
3-(1-Methyl-4-oxo-1,4-dihydro-pyrazolo[3,4-d]-pyrimidin-5-yl... Impurity CS-M-23341 923216-53-9 Enquire
3-(2,5,7-Trimethyl-pyrazolo[1,5-a]pyrimidin-6-yl)-propionic ... Impurity CS-M-10538 851116-09-1 Enquire
3-(6,7-Dihydro-1-methyl-3-propyl-7-thioxo-1H-pyrazolo[4,3-d]... Impurity CS-T-53103 479074-07-2 Enquire
3-(tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazolo[1,5-a]pyrimi... Impurity CS-EM-03493 1169690-88-3 Enquire
3-Bromo-5,7-dimethylpyrazolo[1,5-a]pyrimidine-2-carboxylic a... Impurity CS-M-29040 294194-46-0 Enquire
3-Bromo-5-phenyl-7-(trifluoromethyl)pyrazolo-[1,5-a]pyrimidi... Impurity CS-M-26237 304687-28-3 Enquire
3-Chloro-5-cyclopropyl-7-(trifluoromethyl)-pyrazolo[1,5-a]py... Impurity CS-M-29041 797809-11-1 Enquire
3-Chloro-5-methyl-7-(trifluoromethyl)pyrazolo-[1,5-a]pyrimid... Impurity CS-M-29038 524036-11-1 Enquire
3-Chloro-6-(2-hydroxy-ethyl)-pyrazolo[1,5-a]-pyrimidine-2-ca... Impurity CS-M-09695 842974-84-9 Enquire
3-Chloro-6-methylpyrazolo[1,5-a]pyrimidine-2-carboxylic acid Impurity CS-M-29074 1015846-76-0 Enquire
3-Hydroxy-4,5,6,7-tetrahydro-2H-pyrazolo-[3,4-c]pyridine-5-c... Impurity CS-M-52411 1313739-01-3 Enquire
3-Piperidin-4-yl-1H-pyrazolo[3,4-b]pyrazine dihydrochloride Impurity CS-M-29286 1185112-92-8 Enquire
4,5,6,7-Tetrahydro-1H-pyrazolo[3,4-c]pyridine Dihydrochlorid... Impurity CS-DJ-00843 871726-74-8 Enquire
4,5,6,7-Tetrahydro-1H-pyrazolo[3,4-c]pyridine hydrochloride Impurity CS-M-53259 879668-17-4 Enquire
4,5,6,7-Tetrahydro-1H-pyrazolo[4,3-c]pyridine hydrochloride Impurity CS-M-53211 1187830-85-8 Enquire
4,5,6,7-Tetrahydro-2H-pyrazolo[4,3-b]pyridine hydrochloride Impurity CS-M-53260 1187830-47-2 Enquire
4,5,6,7-Tetrahydro-2-methyl-2H-pyrazolo-[4,3-c]pyridine dihy... Impurity CS-M-55016 157327-45-2 Enquire
4,5-Dihydro-7-[3-(trifluoromethyl)phenyl]-pyrazolo-[1,5-a]py... Impurity CS-M-02724 115931-11-8 Enquire
4,6-Dimethyl-1H-pyrazolo[3,4-b]pyridin-3-ylamine Impurity CS-M-06501 41601-44-9 Enquire
4-Amino-7-methylpyrazolo[5,1-c][1,2,4]triazine-3-carbonitril... Impurity CS-M-49041 63475-17-2 Enquire
4-chloro-1-methyl-1H-Pyrazolo[3,4-d]pyrimidin-6-amine Impurity CS-DV-02706 100644-66-4 Enquire
4-ethoxy-N,N-bis(2-hydroxyethyl)-3-(1-methyl-7-oxo-3-propyl-... Impurity CS-O-35207 226956-43-0 Enquire
5-(2-Ethoxyphenyl)-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo... Impurity CS-T-22410 479074-06-1 Enquire
5-(2-Ethoxyphenyl)-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]py... Impurity CS-T-22414 139756-30-2 Enquire
5-(2-Hydroxyphenyl)-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]p... Impurity CS-T-28297 1159977-45-3 Enquire
5-(2-Thienyl)-7-(trifluoromethyl)pyrazolo-[1,5-a]pyrimidine-... Impurity CS-M-29033 5841-98-5 Enquire
5-(4-bromophenyl)-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidi... Impurity CS-Q-00014 312922-08-0 Enquire
5-(4-Ethoxy-phenyl)-7-methyl-pyrazolo-[1,5-a]pyrimidine-2-ca... Impurity CS-M-07066 354542-40-8 Enquire
5-(4-Ethylphenyl)-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidi... Impurity CS-T-75077 678543-10-7 Enquire
5-(4-Isopropylphenyl)-7-(trifluoromethyl)-pyrazolo[1,5-a]pyr... Impurity CS-M-29061 725699-04-7 Enquire
5-(4-Methoxyphenyl)-7-(trifluoromethyl)pyrazolo-[1,5-a]pyrim... Impurity CS-M-29032 310451-80-0 Enquire
5-(4-Methoxyphenyl)-7-(trifluoromethyl)pyrazolo-[1,5-a]pyrim... Impurity CS-M-29030 333761-72-1 Enquire
5-(Aminomethyl)-2-methyl-3-phenylpyrazolo-[1,5-a]pyrimidin-7... Impurity CS-M-19999 956576-88-8 Enquire
5,7-Bis(trifluoromethyl)-2-(methylthio)pyrazolo-[1,5-a]pyrim... Impurity CS-M-02682 175203-36-8 Enquire
5,7-Dimethyl-6-(2-methylbenzyl)pyrazolo-[1,5-a]pyrimidine-3-... Impurity CS-M-26160 440650-70-4 Enquire
5,7-Diphenyl-pyrazolo[1,5-a]pyrimidine-3-carboxylic Acid Eth... Impurity CS-T-53825 895764-31-5 Enquire
5-Amino-1H-pyrazolo[3,4-b]pyridine Impurity CS-DL-00977 942185-01-5 Enquire
5-Bromo-1H-pyrazolo[3,4-b]pyridin-3-amine Impurity CS-M-51705 405224-24-0 Enquire
5-Bromo-1H-pyrazolo[3,4-b]pyridine-3-carboxylic acid Impurity CS-M-51793 916325-85-4 Enquire
5-Bromopyrazolo[1,5-a]pyridine Impurity CS-DV-03074 1060812-84-1 Enquire
5-Bromo-pyrazolo[1,5-a]pyridine-3-carboxylic acid ethyl este... Impurity CS-DV-03075 885276-93-7 Enquire
5-Chloro-1H-pyrazolo[3,4-b]pyridine Impurity CS-DV-03085 1240725-66-9 Enquire
5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-car... Impurity CS-O-40325 Not Available Enquire
5-Methyl-7-(pentafluoroethyl)-4,5,6,7-tetrahydro-pyrazolo[1,... Impurity CS-M-29073 712319-11-4 Enquire
5-Methyl-7-(trifluoromethyl)pyrazolo-[1,5-a]pyrimidine-3-car... Impurity CS-M-26917 695191-64-1 Enquire
5-tert-Butyl 3-ethyl 1,4,6,7-tetrahydro-5H-pyrazolo[4,3-c]py... Impurity CS-M-28918 518990-23-3 Enquire
5-tert-Butyl 3-ethyl 1-methyl-1,4,6,7-tetrahydro-5H-pyrazolo... Impurity CS-M-28916 1142210-81-8 Enquire
6-(2-Hydroxy-ethyl)-pyrazolo[1,5-a]pyrimidine-2-carboxylic a... Impurity CS-M-09652 712319-12-5 Enquire
6-(2-Hydroxy-ethyl)-pyrazolo[1,5-a]pyrimidine-3-carboxylic a... Impurity CS-M-09696 725693-84-5 Enquire
6-(4-Aminophenyl)-4,5,6,7-tetrahydro-1-(4-methoxyphenyl)-7-o... Impurity CS-T-66518 1466571-07-2 Enquire
6-(Chloromethyl)-1-methyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyri... Impurity CS-M-28552 931075-55-7 Enquire
6-(Difluoromethyl)-4-methyl-1H-pyrazolo[3,4-b]-pyridin-3-ami... Impurity CS-M-20208 925146-05-0 Enquire
6-(tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazolo[1,5-a]pyrimi... Impurity CS-EM-03349 1416437-27-8 Enquire
6,7-Dihydro-6-mercapto-5H-pyrazolo[1,2-a][1,2,4]triazolium c... Impurity CS-O-10655 153851-71-9 Enquire
6-Acetyl-7-methyl-pyrazolo[1,5-a]pyrimidine-3-carboxylic aci... Impurity CS-M-09508 774183-58-3 Enquire
6-Bromo-1H-pyrazolo[4,3-b]pyridine Impurity CS-M-51729 1150617-54-1 Enquire
6-Bromo-3-(1-methyl-1H-pyrazol-4-yl)-5-(3R)-3-piperidinylpyr... Impurity CS-T-49800 891494-63-6 Enquire
6-Bromo-3-(1-methyl-1H-pyrazol-4-yl)-5-(3S)-3-piperidinylpyr... Impurity CS-T-68733 891494-64-7 Enquire
6-Bromo-3-chloropyrazolo[1,5-a]pyrimidine-2-carboxylic acid Impurity CS-M-29024 499190-16-8 Enquire
6-Bromopyrazolo[1,5-a]pyrimidine-3-carboxylic acid Impurity CS-M-29025 912773-22-9 Enquire
6-Chloro-1H-pyrazolo[3,4-b]pyridine Impurity CS-M-51704 63725-51-9 Enquire
6-Chloropyrazolo[1,5-a]pyridine-2-carboxylic acid methyl est... Impurity CS-M-53397 1222709-26-3 Enquire
6-Ethyl-1H-pyrazolo[3,4-b]quinolin-3-ylamine Impurity CS-M-06883 462067-01-2 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-Bromopyrazolo[1,5-c]pyrimidine Intermediate CS-O-54684 1207853-39-1 Enquire
4-Amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidine Intermediate CS-M-53963 151266-23-8 In Stock
5-(2-Ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro- 7H-pyraz... Intermediate CS-T-54350 139756-21-1 In Stock
7-Bromopyrazolo[5,1-b]thiazole Intermediate CS-O-57138 1824091-41-9 Enquire
tert-butyl 3-methyl-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5... Intermediate CS-O-49839 733757-77-2 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
[3-[1-(2-aminoethyl)pyrazolo[3,4-b]pyridin-3-yl]pyrrolidin-1... Fine Chemicals CS-O-36088 1381488-88-3 Enquire
1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxamide Fine Chemicals CS-ZH-16460 256376-62-2 Enquire
1-(4-chlorophenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)-3... Fine Chemicals CS-O-34962 Not Available Enquire
1-(4-hydroxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)-... Fine Chemicals CS-O-34963 Not Available Enquire
1H-Pyrazolo[3,4-b]pyridine-3-carboximidamide, 1-[(2-fluoroph... Fine Chemicals CS-ZE-02210 256376-68-8 Enquire
2-Bromo-7-chloropyrazolo[1,5-a]pyrimidine Fine Chemicals CS-MM-51131 1203705-58-1 Enquire
3-iodo-5-isopropyl-1H-pyrazolo[4,3-b]pyridine Fine Chemicals CS-O-41287 2060590-93-2 Enquire
3-methyl-1H,4H,5H,6H,7H-pyrazolo[3,4-c]pyridine Fine Chemicals CS-O-36444 1466006-16-5 Enquire
5-((4-(3-Carbamoyl-1-(4-methoxyphenyl)-7-oxo-4,5-dihydro-1H-... Fine Chemicals CS-TA-86542 2206825-87-6 Enquire
5-Bromo-1H-pyrazolo[3,4-c]pyridine Fine Chemicals CS-M-55720 929617-35-6 Enquire
5-Chloro-3-nitropyrazolo[1,5-a]pyrimidine Fine Chemicals CS-MM-23380 1363380-51-1 Enquire
7-(3-(ethylamino)phenyl)pyrazolo[1,5-a]pyrimidine-3-carbonit... Fine Chemicals CS-O-40477 940951-59-7 Enquire
benzyl 7-(3-(N-ethylacetamido)phenyl)pyrazolo[1,5-a]pyrimidi... Fine Chemicals CS-O-40476 1227694-82-7 Enquire
ethyl 1h-pyrazolo[3,4-d]pyrimidine-4-carboxylate Fine Chemicals CS-O-36719 2306272-96-6 Enquire
Ethyl 7-[3-(ethylamino)phenyl]pyrazolo[1,5-a]pyrimidine-3-ca... Fine Chemicals CS-O-40478 1227694-80-5 Enquire
Ethyl 7-[3-[acetyl(ethyl)amino]phenyl]pyrazolo[1,5-a]pyrimid... Fine Chemicals CS-O-40475 941315-56-6 Enquire
Methyl 5-chloropyrazolo[1,5-a]pyrimidine-3-carboxylate Fine Chemicals CS-ZE-07595 1224944-51-7 Enquire
methyl 6-hydroxy-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carbo... Fine Chemicals CS-O-36091 2177263-15-7 Enquire
N-Ethyl-N-(3-pyrazolo[1,5-a]pyrimidin-7-ylphenyl)acetamide Fine Chemicals CS-O-40480 941315-45-3 Enquire
Phenylmethyl 7-[3-(ethylamino)phenyl]pyrazolo[1,5-a]pyrimidi... Fine Chemicals CS-O-40479 1227694-84-9 Enquire
tert-butyl 4-(3-cyano-2-(4-phenoxyphenyl)pyrazolo[1,5-a]pyri... Fine Chemicals CS-O-36067 2190506-55-7 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(S)-7-(1-acryloylpiperidin-4-yl)-4-nitroso-2-(4-phenoxypheny... Nitrosamine CS-O-56384 ---- Enquire
4-nitroso-2-(4-phenoxyphenyl)-7-(piperidin-4-yl)-4,5,6,7-tet... Nitrosamine CS-O-54989 ---- Enquire
7-(1-nitrosopiperidin-4-yl)-2-(4-phenoxyphenyl)-4,5,6,7-tetr... Nitrosamine CS-O-54990 ---- Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-Aminopyrazolo[1,5-a]pyrimidin-5-ol Building Blocks CS-O-59748 201599-20-4 Enquire
4-​Bromo-​6-​hydroxypyrazolo[1,​5-​a]​pyridine-​3-​carbonitr... Building Blocks CS-N-05268 2068065-05-2 Enquire
6-chloropyrazolo[1,5-a]pyridine Building Blocks CS-O-38851 894095-29-5 Enquire
7-Bromopyrazolo[1,5-a]pyridine Building Blocks CS-TA-74510 885275-75-2 Enquire
aminopyrazolone Building Blocks CS-O-36739 Not Available Enquire