ISOBARBITURIC ACID
UNII 438WJI1S49

Substance Identification & Data

This profile provides standardized clinical and technical data for Isobarbituric Acid, uniquely identified by the FDA Unique Ingredient Identifier (UNII) 438WJI1S49.

Technical mappings include the Chemical Abstracts Service (CAS) Registry Number 496-76-4 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
438WJI1S49
CAS Registry Number
496-76-4
RxNorm Concept ID
N/A

Detailed Substance Profile

Preferred Name
ISOBARBITURIC ACID
Official standardized name for this substance within the FDA UNII nomenclature system.
InChIKey
C4H4N2O3
International Chemical Identifier digital signature for unique molecular identification.
SMILES String
FQXOOGHQVPKHPG-UHFFFAOYSA-N
Line notation for describing the chemical structure and connectivity of atoms.
PubChem CID
Unique identification number in the NCBI database of chemical substances.
Substance Type
chemical
ISO 11238 classification category (e.g., Chemical, Polymer, Protein).
Ingredient Role
C1(NC(C(CN1)=O)=O)=O

Synonyms and Nomenclature

This section provides a complete list of nomenclature and identifier mappings for Isobarbituric 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.

Common Names & Synonyms

FLUOROURACIL IMPURITY B [EP IMPURITY]
FLUOROURACIL RELATED COMPOUND B [USP IMPURITY]
FLUOROURACIL RELATED COMPOUND B [USP-RS]
ISOBARBITURIC ACID

Systematic Nomenclature

2,4(1H,3H)-PYRIMIDINEDIONE, 5-HYDROXY-
2,4,5(3H)-PYRIMIDINETRIONE, DIHYDRO-
5-HYDROXY-2,4(1H,3H)-PYRIMIDINEDIONE
5-HYDROXYURACIL
DIHYDROPYRIMIDINE-2,4,5(3H)-TRIONE

Technical Codes

NSC-90431
NSC-95958