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

Pyrazole Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-(2-Aminoethyl)-3-nitro-1H-pyrazole-d4 Hydrochloride Stable Isotopes CS-T-100874 Not Available Enquire
1,5-Dimethyl-1H-pyrazole-4-sulfonamide-D3 Stable Isotopes CS-T-102408 88398-55-4(Unlabelled) Enquire
1-Methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-... Stable Isotopes CS-T-96429 Not Available Enquire
1-Methyl-3-propyl-1H-pyrazole-5-carboxylic Acid Ethyl Ester-... Stable Isotopes CS-T-102828 133261-07-1(Unlabelled) Enquire
1-Methyl-3-propyl-1H-pyrazole-5-carboxylic Acid-d3 Stable Isotopes CS-T-102829 1046784-60-4 Enquire
1-Methyl-4-pyrazoleboronic Acid-d3 Stable Isotopes CS-T-102227 Not Available Enquire
3-(4-Chlorophenyl)-4,5-dihydro-N'-(1-iminoethyl)-4-phenyl-N-... Stable Isotopes CS-T-101717 Not Available Enquire
3,4-Dimethylpyrazole Phosphate-13C Stable Isotopes CS-T-101072 Not Available Enquire
3-Amino-5-methylpyrazole 13C4,15N2 Stable Isotopes CS-EK-00994 31230-17-8 unlabeled Enquire
4-[5,6-Dihydro-2-[3-methyl-1-(1-methylethyl)-1H-1,2,4-triazo... Stable Isotopes CS-T-101535 Not Available Enquire
4-Bromo-1-(2-chloroethyl)-1H-pyrazole-D4 Stable Isotopes CS-T-100738 Not Available Enquire
5-Methoxy-d3-1-methyl-1H-pyrazole-4-sulfonyl Chloride Stable Isotopes CS-T-99712 Not Available Enquire
b-Cyclopentyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl... Stable Isotopes CS-T-96435 Not Available Enquire
Mixture of (1,3-Dimethylpyrazole-D3 + 1,5-Dimethylpyrazole-D... Stable Isotopes CS-T-102410 Not Available Enquire
N-(2,3-Dimethylphenyl)-3,5-dimethyl-1-(phenylmethyl)-1H-pyra... Stable Isotopes CS-T-100396 Not Available Enquire
N,N’-Bis-Boc-1-guanylpyrazole-13C,15N2 Stable Isotopes CS-T-101818 1346606-42-5 Enquire


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-(Difluoromethyl)-1-β-D-glucopyranosyl-N-(3′,4′,5′-trifluor... Metabolite CS-ED-42077 2056235-51-7 Enquire
N-Methylpyrazole-4-carboxamide Metabolite CS-O-15650 1154383-52-4 In Stock
Pyrazole 10 Metabolite CS-B-00345 373607-06-8 Enquire
Pyrazole 25 Metabolite CS-B-00344 936134-04-2 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-(1-Ethoxyethyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-... Impurity CS-M-24044 1029716-44-6 Enquire
1-(3,4-dichloro-1-methylpyrazole-5-sulfonyl)-3-(4,6-dimethyl... Impurity CS-O-60817 ---- Enquire
1-(oxan-2-yl)-4-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyr... Impurity CS-EM-02808 1003846-21-6 Enquire
1-[6-Amino-9-(3,4-dihydroxy-5-hydroxymethyl-tetrahydrofuran-... Impurity CS-O-47370 Not Available Enquire
1H-pyrazole-3-carboximidamide hydrochloride Impurity CS-TA-55947 166197-22-4 Enquire
1-phenyl-5-(p-tolyl)-3-(trifluoromethyl)-1H-pyrazole Impurity CS-O-40866 515845-18-8 Enquire
3-(3,3,3-trifluoro-2,2-dimethylpropoxy)-1H-pyrazole Impurity CS-O-45076 2229861-15-6 In Stock
3,5-Dimethyl-1-phenyl-1H-pyrazole-4-carboxylic acid Impurity CS-M-28144 61226-19-5 Enquire
3-Aminopyrazole-4-carboxamide Hemisulfate Impurity CS-O-07140 27511-79-1 In Stock
3-bromo-1-(5-bromo-3-chloropyridin-2-yl)-N-(4-chloro-2-methy... Impurity CS-O-39462 500011-53-0 Enquire
3-Bromo-4-methyl-1H-pyrazole-5-carboxylic Acid Impurity CS-T-94020 929554-40-5 Enquire
3-chloro-5-(N-((4,6-dimethoxypyrimidin-2-yl)carbamoyl)sulfam... Impurity CS-O-60814 ---- Enquire
3-Trifluoromethyl-5-(p-tolyl)-1H-pyrazole Impurity CS-T-45387 219986-64-8 Enquire
4-Amino-1-methyl-3-propyl-1H-pyrazole-5-carboxamide Hydrochl... Impurity CS-T-03054 247584-10-7 Enquire
5-Acetyl-N-[(1S)-2-[3-(3-chloro-4-cyanophenyl)-1H-pyrazol-1-... Impurity CS-O-34554 1297537-33-7 In Stock
5-Amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-4-[(trich... Impurity CS-O-59883 1393738-20-9 Enquire
5-Amino-4-[(chlorodifluoromethyl)sulfinyl]-1-[2,6-dichloro-4... Impurity CS-O-59880 134403-22-8 Enquire
5-Amino-4-[(dichlorofluoromethyl)sulfinyl]-1-[2,6-dichloro-4... Impurity CS-O-59881 134403-23-9 Enquire
5-Chloro-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde Impurity CS-M-16646 947-95-5 Enquire
methyl 2-ethylpyrazole-3-carboxylate Impurity CS-ZJ-07295 119458-46-7 Enquire
N-((R)-1-(3-(3-chloro-4-cyanophenyl)-1H-pyrazol-1-yl)propan-... Impurity CS-O-37396 2407645-49-0 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,3-dimethyl-1H-pyrazole-4-sulfonamide Intermediate CS-O-45632 88398-53-2 In Stock
1-Methyl-3-((methylamino)methyl)-1H-pyrazole Intermediate CS-O-57759 871825-57-9 Enquire
2,4,6,7-Tetrahydropyrano[4,3-c]pyrazole-3-carboxylic acid Intermediate CS-O-49653 933694-89-4 Enquire
3-(Difluoromethyl)-1H-pyrazole-4-carboxylic Acid Intermediate CS-T-91711 151734-02-0 In Stock
3-Aminopyrazole Intermediate CS-T-03410 1820-80-0 In Stock
3-Bromo-1,5-dimethylpyrazole Intermediate CS-O-49760 5744-80-9 Enquire
3-Chloromethyl-1-methylpyrazole Intermediate CS-O-49831 84547-64-8 Enquire
3-Methyl-1-propylpyrazole-4-carbaldehyde Intermediate CS-O-49639 933778-28-0 Enquire
4-Iodo-1H-pyrazole-1-acetonitrile Intermediate CS-O-49531 955965-81-8 Enquire
ethyl 1-methyl-1H-pyrazole-4-carboxylate Intermediate CS-EM-02629 85290-80-8 In Stock
Ethyl 2-((3bS,4aR)-3-(trifluoromethyl)-4,4a-dihydrospiro[cyc... Intermediate CS-O-52391 2375020-09-8 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-(1-(tert-butoxycarbonyl)azetidin-3-yl)-1h-pyrazole-4-carbo... Fine Chemicals CS-O-36717 1785380-40-6 Enquire
1-Benzyl-1H-pyrazole-4-carboxylic acid Fine Chemicals CS-M-09303 401647-24-3 Enquire
1H-Pyrazole-4-carboxamide Fine Chemicals CS-M-47271 437701-80-9 In Stock
1-isopropyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-... Fine Chemicals CS-O-54761 1071496-88-2 Enquire
1-Methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-... Fine Chemicals CS-O-52743 2304634-11-3 Enquire
3,5-Pyrazoledicarboxylic acid monohydrate Fine Chemicals CS-O-53167 303180-11-2 Enquire
3-Isobutyl-1-methyl-4-nitro-1H-pyrazole-5-carboxylic acid Fine Chemicals CS-ZH-28632 1004455-71-3 Enquire
3-Methylpyrazole Fine Chemicals CS-M-57713 1453-58-3 In Stock
4-(Bromomethyl)-1-methyl-1H-pyrazole Fine Chemicals CS-O-54659 762237-02-5 Enquire
4-bromo-1-(1-ethoxyethyl)-1H-pyrazole Fine Chemicals CS-ED-01952 1024120-52-2 Enquire
4-Bromo-1H-pyrazole Fine Chemicals CS-M-16896 2075-45-8 Enquire
4-Bromo-3-cyclopropyl-5-methyl-1H-pyrazole Fine Chemicals CS-BL-00061 1287752-84-4 Enquire
4-Bromo-3-methoxy-1-methyl-1H-pyrazole Fine Chemicals CS-BL-00114 1350323-85-1 Enquire
4-methyl-1H-pyrazole-5-carbaldehyde Fine Chemicals CS-O-38423 1284220-50-3 Enquire
5-(4-phenoxyphenyl)-1H-pyrazole-4-carboxylic acid Fine Chemicals CS-O-60751 1266461-63-5 Enquire
5-amino-1-[2,6-dichloro-4-(trifluoromethyl) phenyl]-4-(ethyl... Fine Chemicals CS-O-36831 120068-56-6 Enquire
5-Amino-1H-pyrazole-4-carbonitrile Fine Chemicals CS-ZE-10731 1204396-41-7 Enquire
5-Amino-1H-pyrazole-4-carboxamide Fine Chemicals CS-EM-01005 5334-31-6 In Stock
5-Bromo-1-methyl-1H-pyrazole-4-carbonitrile Fine Chemicals CS-ZH-01800 1269293-80-2 Enquire
5-Fluoro-1,3-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaboro... Fine Chemicals CS-O-52744 1586046-21-0 Enquire
5-Nitro-1H-pyrazole-3-carboxylic acid Fine Chemicals CS-M-16895 198348-89-9 Enquire
ethyl 5-amino-3-(ethylthio)-1H-pyrazole-4-carboxylate Fine Chemicals CS-O-37714 1037765-43-7 Enquire
Methyl 5-(4-methoxyphenyl)-4-[(E)-phenyldiazenyl]-1H-pyrazol... Fine Chemicals CS-ZH-09882 134454-31-2 Enquire
tert-Butyl 4-amino-1H-pyrazole-1-carboxylate Fine Chemicals CS-MM-52857 1018446-95-1 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-bromo-1-nitroso-1H-pyrazole Nitrosamine CS-O-46671 Not Available Discontinued
4-nitro-1-nitroso-3-propyl-1H-pyrazole-5-carboxamide Nitrosamine CS-O-42917 Not Available Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-methyl-1H-pyrazole-4-carbaldehyde-5-d Stable Isotope Reagent CS-O-48088 2913278-35-8 Enquire
1-methyl-1H-Pyrazole-5-d Stable Isotope Reagent CS-O-48085 50837-66-6 Enquire
1-methyl-d3-1H-pyrazole-3-carbaldehyde Stable Isotope Reagent CS-O-48090 2402829-79-0 Enquire
1-methyl-d3-1H-pyrazole-4-amine dihydrochloride Stable Isotope Reagent CS-O-48092 2567498-20-6 Enquire
1-methyl-d3-1H-pyrazole-4-carbaldehyde Stable Isotope Reagent CS-O-48089 2913418-12-7 Enquire
1-methyl-d3-1H-pyrazole-4-carboxylic acid Stable Isotope Reagent CS-O-48091 2919955-56-7 Enquire
4-(bromomethyl-d2)-1-methyl-1H-pyrazole hydrobromide Stable Isotope Reagent CS-O-47548 528878-44-6 (Unlabelled) Enquire
4-bromo-1-methyl-1H-Pyrazole-5-d Stable Isotope Reagent CS-O-48087 2932439-03-5 Enquire
4-Methyl-1H-pyrazole-3,5-d2 Stable Isotope Reagent CS-C-02129 Not Available Enquire


Therapeutic

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-Methyl-4-nitro-3-propylpyrazole-5-carboxamide Therapeutic CS-T-34289 139756-01-7 In Stock


Heterocyclic

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
hydrazinopyrazole Heterocyclic CS-ED-42020 54962-77-5 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,1′-(4-Phenyl-2,6-pyridinediyl)bis[1H-pyrazole-3-methanol] Building Blocks CS-O-48600 337917-96-1 Enquire
1H-Pyrazole-3-boronic acid Building Blocks CS-M-11330 376584-63-3 Enquire
1H-PYRAZOLE-4-BORONIC ACID Building Blocks CS-DL-00264 763120-58-7 Enquire
4-Bromo-3-chloro-1H-pyrazole Building Blocks CS-ED-01288 27258-18-0 Enquire
4-Bromo-5-methoxy-1H-pyrazole Building Blocks CS-TA-36231 1147011-26-4 Enquire
4-Pyrazoleboronic Acid Pinacol Ester Building Blocks CS-T-40988 269410-08-4 Enquire
5-benzyl-1-methyl-1H-pyrazole-3-carboxylic acid Building Blocks CS-O-36556 2089059-09-4 Enquire
5-phenyl-4,5-dihydro-1H-pyrazole Building Blocks CS-O-48549 936-47-0 Enquire