C6H5NO3
139.11 g/mol
Research ReagentWarning
4-Pyridinecarboxylic acid 1-oxide
CAS13602-12-5EC237-086-6
Category
Research Reagent
Compound Class
Heterocycle
Primary Use
Research Compound
4-Pyridinecarboxylic acid 1-oxide is an N-oxide derivative of isonicotinic acid, featuring a carboxylic acid group attached to a pyridine ring at the 4-position. It is structurally related to picolinic acid and nicotinic acid, which have the carboxyl group at the 2- and 3-positions, respectively.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
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Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for 4-Pyridinecarboxylic acid 1-oxide (CAS 13602-12-5) is 2933.39.
HS code (international, 6-digit)
2933.39
EU CN code (8-digit)
2933 39 99
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
1-oxidopyridin-1-ium-4-carboxylic acid
InChIKey
QCWTWMJMLSKQCJ-UHFFFAOYSA-N
SMILES
C1=C[N+](=CC=C1C(=O)O)[O-]
Synonyms (13)
- 4-Carboxypyridine 1-oxide
- ISONICOTINIC ACID N-OXIDE
- Isonicotinic acid 1-oxide
- Topiroxostat Impurity 3
- pyridine, 1-oxide, 4-carboxy-
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