United States Pharmacopeia (USP) Reference Standard

Aspirin, 2-Acetoxybenzoic acid, Acetylsalicylic acid, ASA, O-Acetylsalicylic acid
Linear Formula:
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
MDL number:
PubChem Substance ID:


pharmaceutical primary standard






134-136 °C (lit.)

Featured Industry

Pharmaceutical (small molecule)



SMILES string




InChI key


Gene Information

human ... PTGS1(5742), PTGS2(5743)

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General description

This product is provided as delivered and specified by the issuing Pharmacopoeia. All information provided in support of this product, including SDS and any product information leaflets have been developed and issued under the Authority of the issuing Pharmacopoeia.For further information and support please go to the website of the issuing Pharmacopoeia.

Biochem/physiol Actions

Blocks the production of prostaglandins by inhibiting cyclooxygenase (prostaglandin H synthase), with greater selectivity toward the COX-1 isoform. The antithrombotic effect is due to the inhibition of COX-1 in platelets that blocks thromboxane production and platelet aggregation. Chemopreventive against colorectal and other solid tumors.

Analysis Note

These products are for test and assay use only. They are not meant for administration to humans or animals and cannot be used to diagnose, treat, or cure diseases of any kind.  ​

Other Notes

USP issued SDS can be found here.
Sales restrictions may apply.


Exclamation mark

Signal Word


Hazard Statements

Precautionary Statements


NONH for all modes of transport

WGK Germany


Flash Point(F)

482.0 °F

Flash Point(C)

250 °C

Certificate of Analysis
Certificate of Origin
Yu-Chi Tung et al.
Medical care, 52(6), 519-527 (2014-05-03)
A volume-outcome relationship has been found for acute myocardial infarction (AMI); however, the mechanisms underlying the relationship remain unclear. In particular, it is not known whether processes of care are mediators of the volume-outcome relationship, that is, whether the mechanisms...
Gwen M C Masclee et al.
Gastroenterology, 147(4), 784-792 (2014-06-18)
Concomitant use of nonsteroidal anti-inflammatory drugs (NSAIDs) and low-dose aspirin increases the risk of upper gastrointestinal bleeding (UGIB). Guidelines suggest avoiding certain drug combinations, yet little is known about the magnitude of their interactions. We estimated the risk of UGIB...
Gideon Sahar et al.
The Journal of thoracic and cardiovascular surgery, 149(4), 1042-1050 (2015-04-25)
We compared the flow rates, reactivity, and morphology of the distal internal thoracic artery and its branches, the superior epigastric and musculophrenic arteries, to test their applicability as possible conduits in coronary artery bypass grafting surgeries. Skeletonized internal thoracic artery...
Laurent Arnaud et al.
Autoimmunity reviews, 13(3), 281-291 (2013-11-06)
We performed a meta-analysis to determine whether aspirin has a significant protective effect on risk of first thrombosis among patients with antiphospholipid antibodies (aPL+). Observational and interventional studies identified from the Medline, Embase and Cochrane databases were selected if they...
Ahmed Kayssi et al.
Journal of vascular surgery, 60(1), 106-110 (2014-03-25)
Acute limb ischemia (ALI) in pediatric patients is rare but may lead to limb loss and life-long complications. This study reviewed the experience of a Canadian tertiary pediatric center with the medical and operative management of ALI. The medical records of...
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Separation of Acetylsalicylic acid, analytical standard; Salicylic acid, BioXtra, ≥99.0%
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Separation of 4-Hydroxybenzoic acid; Acetylsalicylic acid; Benzoic acid; Salicylic acid; Ethyl 4-hydroxybenzoate
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