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CAS 16521-38-3

CAS 16521-38-3 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 16521-38-3
CAS 16521-38-3PubChem CID 61842

C.I. Pigment Blue 63

C.I. Pigment Blue 63 is a member of hydroxyindoles. — ChEBI

IUPAC name
aluminum 2-(3-hydroxy-5-sulfo-1H-indol-2-yl)-3-oxoindole-5-sulfonic acid
Molecular formula
C16H10AlN2O8S2+3
Molecular weight
449.4 g/mol
Exact mass
448.9693960 Da
Topological polar surface area
191.0 Ų
Hydrogen-bond donors
4
Hydrogen-bond acceptors
9
Covalent units
2
Defined stereocentres
0

Also known as

RefChem:572495C.I. Food Blue 1-aluminum lake1342-11-6Certolake indigo carmineIndigotine-aluminum lakealuminum;2-(3-hydroxy-5-sulfo-1H-indol-2-yl)-3-oxoindole-5-sulfonic acidC.I. Food Blue 1:1Indigo carmine-aluminum lake
16 more reported names
Japan Blue 2 Aluminum lakeAcid Blue 74-aluminum lakeJapan Food Blue No. 2 aluminum lakeC.I. 73015 Aluminum lakeC.I. 73015-Aluminum lakeFood Blue No. 2-aluminum lakeC.I. Acid Blue 74-aluminum lakeEINECS 240-589-3Indigo disulfonic acid, aluminum saltFD&C Blue No. 2-aluminum lakeAluminum 3,3'-dioxo-(delta2,2-biindoline)-5,5'disulfonate(delta2,2-Biindoline)-5,5'-disulfonic acid, 3,3'-dioxo-, aluminum saltCHEBI:172686INHYHTBURMMHBG-UHFFFAOYSA-NPigment Blue 63 (Food Blue 1:1)(Z)-3,3'-dioxo-[2,2'-biindolinylidene]-5,5'-disulfonic acid, aluminum(III) salt
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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 16521-38-3

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How CAS 16521-38-3 is used on this site

CAS 16521-38-3 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 16521-38-3 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.