SHEET /m/amaranth-dye · PubChem CID 13506 · CAS 915-67-3 · REV 2026.07

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Amaranth (dye)

from source

C20H11N2Na3O10S3 · 604.5 g/mol

Azorubin S · Red dye number two · Red number two · Azorubine S

What is Amaranth (dye)?

Red 2, banned as a food colouring in the United States in 1976 but still used in much of the rest of the world. from source

CategoryFood & flavor

Chemical familyAromatics Phenols

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Fig. 1 · 2D structure RDKit

SMILESC1=CC=C2C(=C1)C(=CC=C2S(=O)(=O)[O-])N=NC3=C4C=CC…107 characters

Toxicity & hazards

WarningIrritantH315, H319, H335from source

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Where Amaranth (dye) leads

Relatedcomputed

Ponceau 4R63% similarBoth carry a phenol group.Sunset yellow FCF49% similarBoth carry a phenol group.Allura Red AC47% similarBoth carry a phenol group.

Sources & methodology

PubChem CID: 13506
Wikidata: Q421074
Structure: PubChem → RDKit
Similar molecules: MoleculeFinder fingerprint similarity
Data refreshed: October 19, 2026

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