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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


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
tert-Butyl (S)-3-(3-(2,2-dimethoxyethyl)ureido)-2-(4-fluoro-... Impurity CS-O-60675 2212021-60-6 Enquire
(1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)... Impurity CS-O-39331 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)-N-(3-(4-phenoxyphenyl)-1-(piperidin-3-yl)-1Hpyrazolo[ Impurity CS-O-37344 2064175-43-3 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-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
3-(6,7-Dihydro-1-methyl-3-propyl-7-thioxo-1H-pyrazolo[4,3-d]... Impurity CS-T-53103 479074-07-2 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
6-(4-Aminophenyl)-4,5,6,7-tetrahydro-1-(4-methoxyphenyl)-7-o... Impurity CS-T-66518 1466571-07-2 Enquire
Ethyl-1-(4-chlorophenyl)-7-oxo-6-[4-(2-oxopiperidin-1-yl)phe... Impurity CS-O-38291 2029205-62-5 Enquire
methyl 1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)p... Impurity CS-O-39332 Not Available 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
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
1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxamide Fine Chemicals CS-ZH-16460 256376-62-2 Enquire
2-Bromo-7-chloropyrazolo[1,5-a]pyrimidine Fine Chemicals CS-MM-51131 1203705-58-1 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
ethyl 1h-pyrazolo[3,4-d]pyrimidine-4-carboxylate Fine Chemicals CS-O-36719 2306272-96-6 Enquire
methyl 6-hydroxy-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carbo... Fine Chemicals CS-O-36091 2177263-15-7 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
6-chloropyrazolo[1,5-a]pyridine Building Blocks CS-O-38851 894095-29-5 Enquire
aminopyrazolone Building Blocks CS-O-36739 Not Available Enquire