ACETAMINOPHEN - (103-90-2)


Name: acetaminophen; N-(4-hydroxyphenyl)acetamide; paracetamol
CAS Number: 103-90-2
Chemical Formula: C8H9NO2
Molar Mass: 151.16256 g
Mass Percent: C 63.564 %; H 6.0011 %; N 9.2659 %; O 21.168 % 
Isomers:  p-nitroethylbenzene  •  1,3-dimethyl-2-nitrobenzene  •  2,3-dimethylnitrobenzene  •  1,2-dimethyl-4-nitrobenzene


• organic • aromatic • phenol • secondary amine


• "A synthetic drug with antipyretic and analgesic effects similar to those of aspirin, but without anti-inflammatory or antirheumatic effects. It is used for patients who are aspirin-sensitive. Tylenol is a trade name for acetaminophen." 1

• "In addition to its use as a pain reliever, acetaminophen has a number of industrial uses, including: Stabilizer for hydrogen peroxide solutions, to prevent the peroxide from breaking down too quickly...Raw material in the production of other pharmaceutical compounds...Raw material in the manufacture of photographic chemicals...Raw material in the production of azo dyes, dyes that contain nitrogen atoms at the core of their molecules." 2


Double Bonds: 4
Triple Bonds: 0
: 20
: 4
Total: 24
Carboxyl Groups: 0
Hydroxyl Groups: 1

For More Information


(1) - Taber's Cyclopedic Medical Dictionary, 18th ed.; F. A. David Company: Philadelphia, PA, 1997; p 17.
(2) - Schlager, Neil, Weisblatt, Jayne, Newton, David E., and Montney, Charles B. Chemical Compounds Vol. 1; Thomson-Gale: Detroit, MI, 2006; pp 20-21.