Skip to main content
CosIng Checker
CosIng Checker
EU cosmetic ingredients, restrictions and safety
Login
CAS 0 records

CAS 331-39-5

CAS 331-39-5 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

Check this CAS numberBrowse annexes

Chemical identity and properties

PubChem 2D chemical structure for CAS 331-39-5
CAS 331-39-5PubChem CID 689043

Caffeic Acid

3,4-dihydroxycinnamic acid appears as yellow prisms or plates (from chloroform or ligroin) or pale yellow granules. Alkaline solutions turn from yellow to orange. (NTP, 1992) — CAMEO Chemicals

IUPAC name
(E)-3-(3,4-dihydroxyphenyl)prop-2-enoic acid
Molecular formula
C9H8O4
Molecular weight
180.16 g/mol
Exact mass
180.04225873 Da
XLogP3
1.2
Topological polar surface area
77.8 Ų
Hydrogen-bond donors
3
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
0

Also known as

3,4-Dihydroxycinnamic acid3,4-Dihydroxybenzeneacrylic acid3-(3,4-Dihydroxyphenyl)-2-propenoic acidCinnamic acid, 3,4-dihydroxy-2-Propenoic acid, 3-(3,4-dihydroxyphenyl)-4-(2-Carboxyethenyl)-1,2-dihydroxybenzene3-(3,4-Dihydroxyphenyl)propenoic acid4-(2'-Carboxyvinyl)-1,2-dihydroxybenzene
16 more reported names
NSC 57197U2S3A33KVMNSC-57197NSC-623438CHEBI:36281trans-3,4-Dihydroxycinnamic AcidCHEBI:164332-Propenoic acid, 3-(3,4-dihydroxyphenyl)-, (2E)-CHEBI:17395Caffeic Acid 1507caffeic acid, (E)-RefChem:6400Trans 3,4-Dihydroxycinnamic acid206-361-2(2Z)-3-(3,4-dihydroxyphenyl)prop-2-enoic acidcis-Caffeic acid
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 331-39-5

0 total
No records found for this CAS number.

How CAS 331-39-5 is used on this site

CAS 331-39-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 331-39-5 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.