Acetaminophen

CAS Registry Number®

103-90-2

CAS Name

Acetaminophen

Molecular Formula

C8H9NO2

Molecular Mass

151.16

Cite this Page

Acetaminophen.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?cas_rn=8055-08-1 (retrieved 2025-05-21) (CAS RN: 103-90-2).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Boiling Point (1)

    500 °C

  • Melting Point (2)

    169-170.5 °C

  • Density (2)

    1.293 g/cm³ @ Temp: 21 °C

Source(s)

  • (1) International Chemical Safety Cards data were obtained from the National Institute for Occupational Safety and Health (US)
  • (2) Hazardous Substances Data Bank data were obtained from the National Library of Medicine (US)

Other Names and Identifiers

InChI

InChI=1S/C8H9NO2/c1-6(10)9-7-2-4-8(11)5-3-7/h2-5,11H,1H3,(H,9,10)

InChIKey

InChIKey=RZVAJINKPMORJF-UHFFFAOYSA-N

SMILES

N(C(C)=O)C1=CC=C(O)C=C1

Canonical SMILES

O=C(NC1=CC=C(O)C=C1)C

Other Names for this Substance

  • Acetamide, N-(4-hydroxyphenyl)-
  • Acetanilide, 4′-hydroxy-
  • N-(4-Hydroxyphenyl)acetamide
  • Acetagesic
  • p-Acetamidophenol

View All

Deleted or Replaced CAS Registry Numbers

8055-08-1, 719293-04-6, 1430221-00-3

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