Pyrazinoic acid

Pyrazinoic acid
IUPAC name pyrazine-2-carboxylic acid
Identifiers
CAS number	98-97-5 Y
PubChem	1047
ChemSpider	1018 Y
MeSH	Pyrazinoic+acid
ChEBI	CHEBI:71311 Y
ChEMBL	CHEMBL613 Y
Jmol-3D images	Image 1
SMILES O=C(O)c1nccnc1
InChI InChI=1S/C5H4N2O2/c8-5(9)4-3-6-1-2-7-4/h1-3H,(H,8,9) Y Key: NIPZZXUFJPQHNH-UHFFFAOYSA-N Y InChI=1/C5H4N2O2/c8-5(9)4-3-6-1-2-7-4/h1-3H,(H,8,9) Key: NIPZZXUFJPQHNH-UHFFFAOYAS
Properties
Molecular formula	C5H4N2O2
Molar mass	124.10 g/mol
Appearance	white to off white crystalline powder
Density	1.403g/cm3
Melting point	222-225°C
Boiling point	313.1°C @760mmHg
Solubility in water	soluble in cold water
Acidity (pKa)	2.9
Hazards
Flash point	143.1°C
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Pyrazinoic acid is a pyrazinamide metabolite.