Phenacetin melting point standard

Pharmaceutical Secondary Standard; Certified Reference Material

p-Acetophenetidide, Acetophenetidin, 1-Acetyl-p-phenetidin, Phenacetin, 4′-Ethoxyacetanilide, N-(4-Ethoxyphenyl)acetamide
Linear Formula:
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


certified reference material
pharmaceutical secondary standard




current certificate can be downloaded


HPLC: suitable
gas chromatography (GC): suitable


~Approximately 135 °C
133-136 °C (lit.)

Featured Industry

Pharmaceutical (small molecule)



pharmacopeia traceability

traceable to USP 1514008

SMILES string




InChI key


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General description

Phenacetin is a mild analgesic drug effective for the treatment of mild to moderate pain. Its analgesic property is comparable to that of aspirin.
Pharmaceutical secondary standards for application in quality control, provide pharma laboratories and manufacturers with a convenient and cost-effective alternative to the preparation of in-house working standards.


These Secondary Standards are qualified as Certified Reference Materials. These are suitable for use in several analytical applications including but not limited to pharma release testing, pharma method development for qualitative and quantitative analyses, food and beverage quality control testing, and other calibration requirements.
Phenacetin may be used as a calibration standard for the development of a test for the evaluation of phenacetin by thermal analyzes methods.

Biochem/physiol Actions

Substrate of CYP1A2 and CYP2D6.

Analysis Note

These secondary standards offer multi-traceability to the USP, EP (PhEur) and BP primary standards, where they are available.

Other Notes

This Certified Reference Material (CRM) is produced and certified in accordance with ISO 17034 and ISO/IEC 17025. All information regarding the use of this CRM can be found on the certificate of analysis.


To see an example of a Certificate of Analysis for this material enter LRAC4010 in the slot below. This is an example certificate only and may not be the lot that you receive.


Exclamation markHealth hazard

Signal Word


Hazard Statements


UN 3077 9 / PGIII

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
Purity and heat of fusion data for environmental standards as determined by differential scanning calorimetry
Donnelly JR, et al.
Thermochimica Acta, 167(2), 155-187 (1990)
Broad range purity analysis by melting point depression using a singular feature common to all DSC purity scans
Gustin GM
Thermochimica Acta, 39(2), 81-93 (1980)
Paracetamol and phenacetin
Clissold SP
Drugs, 32(4), 46-59 (1986)
Analgesic nephropathy: a reassessment of the role of phenacetin and other analgesics.
L F Prescott
Drugs, 23(1-2), 75-149 (1982-01-01)
J A Hinson
Environmental health perspectives, 49, 71-79 (1983-03-01)
Phenacetin can be metabolized to reactive metabolites by a variety of mechanisms. (1) Phenacetin can be N-hydroxylated, and the resulting N-hydroxyphenacetin can be sulfated or glucuronidated. Whereas phenacetin N-O sulfate immediately rearranges to form a reactive metabolite which may covalently...
US EPA Method 8270 (Appendix IX): GC Analysis of Semivolatiles on Equity®-5 (30 m x 0.25 mm I.D., 0.50 μm)
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