Inactive / Discontinued
ACID ORANGE 20
UNII W9Q9OB858O
Substance Identification & Data
This profile provides standardized clinical and technical data for Acid Orange 20, uniquely identified by the FDA Unique Ingredient Identifier (UNII) W9Q9OB858O.
Technical mappings include the Chemical Abstracts Service (CAS) Registry Number 523-44-4 and the RxNorm Concept ID (RxCUI) 2375722. Explore the sections below for detailed nomenclature and a complete directory of NDC-listed products containing this ingredient.
Detailed Substance Profile
Preferred Name
ACID ORANGE 20
Official standardized name for this substance within the FDA UNII nomenclature system.
Molecular Formula
W9Q9OB858O
The specific atomic composition represented as a molecular structure string.
InChIKey
C16H11N2O4S.Na International Chemical Identifier digital signature for unique molecular identification.
SMILES String
AZLXCBPKSXFMET-ZAGWXBKKSA-M Line notation for describing the chemical structure and connectivity of atoms.
Substance Type
chemical
ISO 11238 classification category (e.g., Chemical, Polymer, Protein).
Ingredient Role
[Na+].c1(ccc(cc1)/N=N/c2ccc(c3ccccc23)O)S(=O)(=O)[O-]
Synonyms and Nomenclature
This section provides a complete list of nomenclature and identifier mappings for Acid Orange 20. Identifiers are organized into official regulatory terms, commercial trade names, and technical systematic synonyms used to ensure accurate identification across clinical pharmaceutical databases, regulatory filings, and electronic health records.
Common Names & Synonyms
.ALPHA.-NAPHTHOL ORANGE
4-((4-HYDROXY-1-NAPHTHALENYL)AZO)BENZENESULFONIC ACID, MONOSODIUM SALT
4-(P-SULFOPHENYLAZO)-1-NAPHTHOL, SODIUM SALT
A.F. ORANGE NO. 1
ACID LEATHER ORANGE I
ACID ORANGE 20
C.I. ACID ORANGE 20
C.I. ACID ORANGE 20 [HSDB]
CI ACID ORANGE 20 [IARC]
EXT D AND C ORANGE NO. 3
FD&C ORANGE NO. 1 (DELISTED)
JAPAN ORANGE 1
NAPHTHOL ORANGE
ORANGE I
ORANGE I [MI]
TROPAEOLIN 1
YELLOW 404
Systematic Nomenclature
BENZENESULFONIC ACID, 4-((4-HYDROXY-1-NAPHTHALENYL)AZO)-,MONOSODIUM SALT
BENZENESULFONIC ACID, 4-(2-(4-HYDROXY-1- NAPHTHALENYL)DIAZENYL)-, SODIUM SALT
SODIUM 4-((4-HYDROXY-1-NAPHTHYL)AZO)BENZENESULPHONATE
Technical Codes
NSC-10449
NDC Products Containing ACID ORANGE 20
This unique ingredient identifier is listed as an ingredient or substance in the following products in the NDC directory:
