Skip to main content
CosIng Checker
CosIng Checker
EU cosmetic ingredients, restrictions and safety
Login
CAS 1 record

CAS 91-64-5

CAS 91-64-5 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

Check this CAS numberBrowse annexes

Chemical identity and properties

PubChem 2D chemical structure for CAS 91-64-5
CAS 91-64-5PubChem CID 323

Coumarin

Coumarin is a chromenone having the keto group located at the 2-position. It has a role as a fluorescent dye, a plant metabolite and a human metabolite. — ChEBI

IUPAC name
chromen-2-one
Molecular formula
C9H6O2
Molecular weight
146.14 g/mol
Exact mass
146.036779430 Da
XLogP3
1.4
Topological polar surface area
26.3 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
2
Covalent units
1
Defined stereocentres
0

Also known as

2H-Chromen-2-one2H-1-Benzopyran-2-onecumarin1,2-BenzopyroneTonka bean camphorRattexCoumarinic anhydrideCoumarine
16 more reported names
cis-o-Coumarinic acid lactoneCoumarinic lactoneo-Hydroxycinnamic acid lactoneBenzo-alpha-pyrone5,6-Benzo-2-pyroneo-Hydroxycinnamic lactone2-Oxo-1,2-benzopyranKumarin2H-Benzo(b)pyran-2-one2H-1-Benzopyran, 2-oxo-5,6-Benzo-alpha-pyroneBenzo-a-pyroneo-Coumaric acid lactoneo-Hydroxyzimtsaure-lactonCoumarinumcis-o-Coumaric acid anhydride
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 91-64-5

1 total
Annex
III
Entry
77

Coumarin

2H-1-Benzopyran-2-one

The presence of the substance must be indicated in the list of ingredients referred to in Article 19(1)g when its concentration exceeds: - 0.001% in leave-on products - 0.01% in rinse-off products

EC
202-086-7

How CAS 91-64-5 is used on this site

CAS 91-64-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares 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 91-64-5 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.

Frequently asked questions

A substance identified by CAS 91-64-5 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts. For example, a substance might be restricted under Annex III with specific conditions, and the same CAS might also appear in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

Cross-reference the CAS number against your raw material specification sheets and CoA documents. When a CAS appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met in your formulation. All annex entries sharing this CAS number are listed above.

A CAS number is assigned by the Chemical Abstracts Service (USA) and is globally recognised. An EC number is a European Commission identifier from inventories such as EINECS, ELINCS or the NLP list. Both identifiers may appear in EU cosmetic annex entries. Some substances have both, some have only one, and some older entries may have neither.

The INCI Checker accepts ingredient names, CAS numbers and EC numbers. Check this CAS number directly, then verify the result against supplier specification sheets and every linked annex condition.
Check this CAS number

Tools & next steps

Check your formula

Scan a full INCI list, then use CAS 91-64-5 to cross-check any supplier documents behind the matched substances.

INCI Checker

Browse annexes

Browse all EU cosmetic regulation annexes by category.

All annexes

Search by name

Search for INCI names, aliases or related identifiers that sit alongside CAS 91-64-5 in your documentation.

Search