1-Methyl-4-nitro-3-propyl-1H-pyrazole-5-carboxamide
- CAS
- 139756-01-7
- Formula
- C8H12N4O3
- MW
- 212.21 g/mol
VQ-028020
Impurity reference standards
Sildenafil impurities & reference standards
Characterised Sildenafil impurities, degradation products and related compounds for analytical method development, validation, QC release and regulatory filings.
58reference materials
4isotope-labelled
COAHPLC · NMR · MS on request
Parent API: Sildenafil Citrate
171599-83-0 · C28H38N6O11S
1-Methyl-4-nitro-3-propyl-1H-pyrazole-5-carboxylic acid
- CAS
- 139756-00-6
- Formula
- C8H11N3O4
- MW
- 213.19 g/mol
VQ-023752
1-Methyl-4-nitro-5-propyl-1H-pyrazole-3-carboxamide
- CAS
- 247583-72-8
- Formula
- C8H12N4O3
- MW
- 212.21 g/mol
VQ-042159
![2-Ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]- benzoic Acid chemical structure](/media/structures/TXKSEEXWAGLOIY-UHFFFAOYSA-N.svg)
2-Ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]- benzoic Acid
- CAS
- 194602-23-8
- Formula
- C14H20N2O5S
- MW
- 328.39 g/mol
VQ-042161
3-Isobutyl-1-methyl-4-nitro-1H-pyrazole-5-carboxylic acid
- CAS
- 1004455-71-3
- Formula
- C9H13N3O4
- MW
- 227.22 g/mol
VQ-044017
![4-[(2-Ethoxybenzoyl)amino]-1-methyl-5-propyl-1H-pyrazole-3-carboxamide chemical structure](/media/structures/HFNOLZIPTBNLMC-UHFFFAOYSA-N.svg)
4-[(2-Ethoxybenzoyl)amino]-1-methyl-5-propyl-1H-pyrazole-3-carboxamide
- CAS
- 501120-38-3
- Formula
- C17H22N4O3
- MW
- 330.4 g/mol
VQ-043166
![4-[[2-Ethoxy-5-[(4-methyl-1-piperazinyl)- sulfonyl]benzoyl]amino]-1-methyl-3-propyl- 1H-pyrazole-5-carboxamide chemical structure](/media/structures/IFFGTBBYPRZJLD-UHFFFAOYSA-N.svg)
4-[[2-Ethoxy-5-[(4-methyl-1-piperazinyl)- sulfonyl]benzoyl]amino]-1-methyl-3-propyl- 1H-pyrazole-5-carboxamide
- CAS
- 200575-15-1
- Formula
- C22H32N6O5S
- MW
- 492.6 g/mol
VQ-028022
4-Amino-1-methyl-3-(2-methylpropyl)-1H-pyrazole-5-carboxamide
- CAS
- 268204-00-8
- Formula
- C9H16N4O
- MW
- 196.25 g/mol
VQ-042164
4-Amino-1-methyl-3-propyl-1H-pyrazole-5-carboxamide Hydrochloride
- CAS
- 247584-10-7
- Formula
- C8H15ClN4O
- MW
- 218.68 g/mol
VQ-033837
4-Amino-1-methyl-5-propyl-1H-pyrazole-3-carboxamide
- CAS
- 247583-78-4
- Formula
- C8H14N4O
- MW
- 182.22 g/mol
VQ-043296
![4-Ethoxy-N,N-bis(2-hydroxyethyl)-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonamide chemical structure](/media/structures/ASLYFRXJVSDKKL-UHFFFAOYSA-N.svg)
4-Ethoxy-N,N-bis(2-hydroxyethyl)-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonamide
- CAS
- 226956-43-0
- Formula
- C21H29N5O6S
- MW
- 479.6 g/mol
VQ-043294
![5-(2-Ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro- 7H-pyrazolo[4,3-d]pyrimidin-7-one chemical structure](/media/structures/MXQUEDUMKWBYHI-UHFFFAOYSA-N.svg)
5-(2-Ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro- 7H-pyrazolo[4,3-d]pyrimidin-7-one
- CAS
- 139756-21-1
- Formula
- C17H20N4O2
- MW
- 312.37 g/mol
VQ-023753
![5-(2-Ethoxyphenyl)-3-isobutyl-1-methyl-1,4-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one](/media/pack/5-2-ethoxyphenyl-3-isobutyl-1-methyl-14-dihydro-7h-pyrazolo43-dpyrimidin-7-one.svg?v=3)
5-(2-Ethoxyphenyl)-3-isobutyl-1-methyl-1,4-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
- CAS
- 1467610-65-6
- Formula
- C18H22N4O2
- MW
- 326.39 g/mol
VQ-044018
![5-(5-Carboxy-2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one chemical structure](/media/structures/UUNWDXYDLDBMRV-UHFFFAOYSA-N.svg)
5-(5-Carboxy-2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
- CAS
- 147676-78-6
- Formula
- C18H20N4O4
- MW
- 356.4 g/mol
VQ-028023
De(methypiperazinyl) Sildenafil Dimer Impurity
- CAS
- 1346603-48-2
- Formula
- C34H38N8O6S
- MW
- 686.8 g/mol
VQ-042163
Demethylpiperazinyl Desethyl Sildenafil Sulfonyl Chloride
- CAS
- 139756-27-7
- Formula
- C15H15ClN4O4S
- MW
- 382.8 g/mol
VQ-043587
![Ethyl 4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonate chemical structure](/media/structures/DBEUWCBPDBKWCB-UHFFFAOYSA-N.svg)
Ethyl 4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonate
- CAS
- 1971915-89-5
- Formula
- C19H24N4O5S
- MW
- 420.5 g/mol
VQ-028025
FAQs — Sildenafil impurities
Which Sildenafil impurities do you supply?
We list 58 Sildenafil-related reference materials, including process impurities, degradation products, stable-isotope-labelled standards and related compounds. Each is supplied with a COA, and characterisation data (HPLC, 1H-NMR, MS, IR) can be provided on request.
What are Sildenafil impurity standards used for?
They are used for analytical method development and validation, impurity identification and quantification, forced-degradation and stability studies, and to support ANDA, DMF and other regulatory submissions under ICH Q3A/Q3B (and ICH M7 for mutagenic impurities).
Can you synthesise a Sildenafil impurity that is not listed?
Yes. Our custom synthesis service can prepare and characterise unlisted impurities, metabolites and labelled analogues from milligram to gram scale. Share the structure or name and required quantity for a quotation.
Request Sildenafil impurity standards
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