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Pharmacopeial Impurities (EP / USP / BP)

Phenylbutazone EP Impurity B

Reference StandardAvailable on request

Order Phenylbutazone EP Impurity B (CAS 16860-43-8) online at Zemixal. Request a quote with price, lead time and documents.

Pack sizes
Phenylbutazone EP Impurity B chemical structure
CAS number16860-43-8
FormulaC19H20N2O3
Molar mass324.4 g/mol
Physical formSolid
HS code38229090
InChIKeyVTEBWXHYBNAYKI-UHFFFAOYSA-N
IUPAC name4-butyl-4-hydroxy-1,2-diphenylpyrazolidine-3,5-dione

About Phenylbutazone EP Impurity B

Phenylbutazone EP Impurity B is supplied by Zemixal as a characterised reference material for Phenylbutazone analysis. Key data (Reference Standard): CAS 16860-43-8, formula C19H20N2O3 and molar mass 324.4 g/mol. It is handled as a solid.

Use cases we see most often

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

Safe handling

Classified under GHS with signal word Danger and hazard statements H301, H302 and H319. Read the SDS before first use.

Standard pack sizes are 10 mg, 25 mg, 50 mg and 100 mg, and custom quantities are quoted on request. Each lot travels with a certificate of analysis with characterisation data. Send an enquiry through the quote panel and you get a formal offer with Incoterms and delivery time.

Reference standards for Phenylbutazone

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

Phenylbutazone standards

Typical uses

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

Applications

Grade guides

Specifications and identifiers

Specifications of Phenylbutazone EP Impurity B
Product namePhenylbutazone EP Impurity B
Catalogue numberZX-026379
CAS number16860-43-8
IUPAC name4-butyl-4-hydroxy-1,2-diphenylpyrazolidine-3,5-dione
Molecular formulaC19H20N2O3
Molar mass324.4 g/mol
Exact mass324.1474
GradeReference Standard
Physical formSolid
XLogP33.5
H-bond donors / acceptors1 / 3
Topological polar surface area60.9 Ų
HS code38229090
InChIKeyVTEBWXHYBNAYKI-UHFFFAOYSA-N
SMILESCCCCC1(C(=O)N(N(C1=O)C2=CC=CC=C2)C3=CC=CC=C3)O
PubChem CID101102
Synonyms4-Hydroxyphenylbutazone, Phenylbutazone - Impurity B, 4-Butyl-4-hydroxy-1,2-diphenyl-3,5-pyrazolidinedione, 3,5-Pyrazolidinedione, 4-butyl-4-hydroxy-1,2-diphenyl-, 4-Hydroxy Phenylbutazone, 1,2-Diphenyl-4-butyl-4-hydroxypyrazolidine-3,5-dione, Phenylbutazone, 4-hydroxy, 4-butyl-4-hydroxy-1,2-diphenyl-pyrazolidine-3,5-dione, 4-Butyl-4-hydroxy-1,2-diphenyl-3,5-pyrazolidinedione #

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

Safety and GHS hazards

GHS06 Acute toxicity
Acute toxicity
GHS07 Irritant or harmful
Irritant or harmful

Signal word Danger

  • H301Toxic if swallowed
  • H302Harmful if swallowed
  • H319Causes serious eye irritation

Precautionary statements P264, P264 + P265, P270, P280, P301 + P316, P301 + P317, P305 + P351 + P338, P321, P330, P337 + P317, P405, P501

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 Phenylbutazone EP Impurity B
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 Phenylbutazone EP Impurity B

Which CAS number identifies Phenylbutazone EP Impurity B?
Phenylbutazone EP Impurity B is registered under CAS 16860-43-8. You may also see it listed as 4-Hydroxyphenylbutazone, Phenylbutazone - Impurity B, 4-Butyl-4-hydroxy-1,2-diphenyl-3,5-pyrazolidinedione. Our catalogue number for this item is ZX-026379.
What are the formula and molar mass of Phenylbutazone EP Impurity B?
For Phenylbutazone EP Impurity B, its formula is C19H20N2O3 and its molar mass is 324.4 g/mol. The systematic (IUPAC) name is 4-butyl-4-hydroxy-1,2-diphenylpyrazolidine-3,5-dione. InChIKey VTEBWXHYBNAYKI-UHFFFAOYSA-N lets you match it in any structure database.
How is Phenylbutazone EP Impurity B used in pharmaceutical QC?
Phenylbutazone EP Impurity B is a characterised reference material linked to Phenylbutazone. 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 Phenylbutazone EP Impurity B?
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 Phenylbutazone EP Impurity B?
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 Phenylbutazone EP Impurity B to my country?
Yes. Because Phenylbutazone EP Impurity B 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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