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Pharmacopeial Impurities (EP / USP / BP)

Sildenafil EP Impurity C

Reference StandardAvailable on request

Sildenafil EP Impurity C (CAS 139755-91-2) supplier Zemixal. Lab and bulk packs, batch COA, fast global delivery. Packs from 10 mg.

Pack sizes
Sildenafil EP Impurity C chemical structure
CAS number139755-91-2
FormulaC20H26N6O4S
Molar mass446.5 g/mol
Physical formSolid
HS code38229090
InChIKeyLTNJUPYNXDNXBO-UHFFFAOYSA-N
IUPAC name5-[2-hydroxy-5-(4-methylpiperazin-1-yl)sulfonylphenyl]-1-methyl-3-propyl-6H-pyrazolo[4,5-d]pyrimidin-7-one

About Sildenafil EP Impurity C

Zemixal lists Sildenafil EP Impurity C for laboratories that identify, quantify or control Sildenafil and its related substances. For your records (Reference Standard), the material is defined by CAS 139755-91-2, formula C20H26N6O4S and molar mass 446.5 g/mol. It is handled as a solid.

Common uses in the lab and plant

  • Pharmacopeial method verification
  • Impurity profiling
  • QC release testing
  • ANDA / DMF filings

Handling and storage

It carries the GHS signal word Warning (H302+H312+H332, H302, H312 and H315), so wear gloves and eye protection and work with good ventilation.

Available as 10 mg, 25 mg, 50 mg and 100 mg. Larger or split packs can be arranged. You receive a certificate of analysis with characterisation data with each order. Request pricing online and we confirm availability, documentation and freight to your country.

Reference standards for Sildenafil

See every impurity, metabolite and related compound we list for this API.

Sildenafil standards

Typical uses

  • Pharmacopeial method verification
  • Impurity profiling
  • QC release testing
  • ANDA / DMF filings

Applications

Pharmaceutical Manufacturing and QCResearch Labs and Universities

Grade guides

Ph. Eur. Grade (European Pharmacopoeia)

Specifications and identifiers

Specifications of Sildenafil EP Impurity C
Product nameSildenafil EP Impurity C
Catalogue numberZX-022767
CAS number139755-91-2
IUPAC name5-[2-hydroxy-5-(4-methylpiperazin-1-yl)sulfonylphenyl]-1-methyl-3-propyl-6H-pyrazolo[4,5-d]pyrimidin-7-one
Molecular formulaC20H26N6O4S
Molar mass446.5 g/mol
Exact mass446.1736
GradeReference Standard
Physical formSolid
XLogP30.8
H-bond donors / acceptors2 / 8
Topological polar surface area129 Ų
HS code38229090
InChIKeyLTNJUPYNXDNXBO-UHFFFAOYSA-N
SMILESCCCC1=NN(C2=C1N=C(NC2=O)C3=C(C=CC(=C3)S(=O)(=O)N4CCN(CC4)C)O)C
PubChem CID135565516
SynonymsDesethyl Sildenafil, Sildenafil Citrate - Impurity C, o-Desethyl sildenafil, Sildenafil Impurity C, Sildenafil citrate impurity C, O-Desethylsildenafil

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

GHS07 Irritant or harmful
Irritant or harmful

Signal word Warning

  • H302+H312+H332Harmful if swallowed, in contact with skin or if inhaled
  • H302Harmful if swallowed
  • H312Harmful in contact with skin
  • H315Causes skin irritation
  • H317May cause an allergic skin reaction
  • H319Causes serious eye irritation
  • H332Harmful if inhaled
  • H335May cause respiratory irritation
  • H336May cause drowsiness or dizziness
  • H362May cause harm to breast-fed children
  • H412Harmful to aquatic life with long lasting effects

Precautionary statements P203, P260, P261, P263, P264, P264 + P265, P270, P271, P272, P273, P280, P301 + P317, P302 + P352, P304 + P340, P305 + P351 + P338, P317, P318, P319, P321, P330, P332 + P317, P333 + P317, P337 + P317, P362 + P364

Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of Sildenafil EP Impurity C
10 mgQuoted on request
25 mgQuoted on request
50 mgQuoted on request
100 mgQuoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about Sildenafil EP Impurity C

Which CAS number identifies Sildenafil EP Impurity C?
Sildenafil EP Impurity C is registered under CAS 139755-91-2. You may also see it listed as Desethyl Sildenafil, Sildenafil Citrate - Impurity C, o-Desethyl sildenafil. Our catalogue number for this item is ZX-022767.
What are the formula and molar mass of Sildenafil EP Impurity C?
For Sildenafil EP Impurity C, its formula is C20H26N6O4S and its molar mass is 446.5 g/mol. The systematic (IUPAC) name is 5-[2-hydroxy-5-(4-methylpiperazin-1-yl)sulfonylphenyl]-1-methyl-3-propyl-6H-pyrazolo[4,5-d]pyrimidin-7-one. InChIKey LTNJUPYNXDNXBO-UHFFFAOYSA-N lets you match it in any structure database.
How is Sildenafil EP Impurity C used in pharmaceutical QC?
Sildenafil EP Impurity C is a characterised reference material linked to Sildenafil. Laboratories use it to identify and quantify this impurity during method development and validation, stability work, batch release testing and regulatory submissions.
What grade and pack sizes are available for Sildenafil EP Impurity C?
This listing is Reference Standard grade. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg. Larger quantities and custom packing can be quoted on request.
Which documents come with Sildenafil EP Impurity C?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship Sildenafil EP Impurity C to my country?
Yes. Because Sildenafil EP Impurity C is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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