DIRECT RED 81 FREE ACID
UNII RLM8W5IPXB

Substance Identification & Data

This profile provides standardized clinical and technical data for Direct Red 81 Free Acid, uniquely identified by the FDA Unique Ingredient Identifier (UNII) RLM8W5IPXB.

Technical mappings include the Chemical Abstracts Service (CAS) Registry Number 25188-42-5 and the RxNorm Concept ID (RxCUI) N/A. Explore the sections below for detailed nomenclature and a complete directory of NDC-listed products containing this ingredient.

FDA UNII Code

RLM8W5IPXB

CAS Registry Number

25188-42-5

RxNorm Concept ID

N/A

Detailed Substance Profile

Preferred Name

DIRECT RED 81 FREE ACID

Official standardized name for this substance within the FDA UNII nomenclature system.

InChIKey

C29H21N5O8S2

International Chemical Identifier digital signature for unique molecular identification.

SMILES String

IGXZMQCLUNTWCC-HSBKYFPUSA-N

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

OS(=O)(=O)c1ccc(cc1)/N=N/c2ccc(cc2)/N=N/c3c(S(O)(=O)=O)cc4cc(ccc4c3O)NC(=O)c5ccccc5

Synonyms and Nomenclature

This section provides a complete list of nomenclature and identifier mappings for Direct Red 81 Free Acid. 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.