isonicotinic acid

{{chembox

|Watchedfields = changed

|verifiedrevid = 443884866

|Reference =[http://chemicalland21.com/lifescience/phar/ISONICOTINIC%20ACID.htm Isonicotinic acid] at chemicalland21.com

|Name = Isonicotinic acid

|ImageFileL1 = Isonicotinic acid.png

|ImageNameL1 = Skeletal formula

|ImageFileR1 = Isonicotinic-acid-3D-balls.png

|ImageNameR1 = Ball-and-stick model

|PIN = Pyridine-4-carboxylic acid

|OtherNames = Isonicotinic acid
4-Pyridinecarboxylic acid
p-Pyridinecarboxylic acid
4-Picolinic acid

|Section1={{Chembox Identifiers

|ChEBI_Ref = {{ebicite|correct|EBI}}

|ChEBI = 6032

|SMILES = c1cnccc1C(=O)O

|ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

|ChemSpiderID = 5709

|UNII_Ref = {{fdacite|correct|FDA}}

|UNII = Y8SYN761TQ

|KEGG_Ref = {{keggcite|correct|kegg}}

|KEGG = C07446

|InChI = 1/C6H5NO2/c8-6(9)5-1-3-7-4-2-5/h1-4H,(H,8,9)

|InChIKey = TWBYWOBDOCUKOW-UHFFFAOYAV

|ChEMBL_Ref = {{ebicite|correct|EBI}}

|ChEMBL = 1203

|StdInChI_Ref = {{stdinchicite|correct|chemspider}}

|StdInChI = 1S/C6H5NO2/c8-6(9)5-1-3-7-4-2-5/h1-4H,(H,8,9)

|StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

|StdInChIKey = TWBYWOBDOCUKOW-UHFFFAOYSA-N

|CASNo_Ref = {{cascite|correct|CAS}}

|CASNo = 55-22-1

|PubChem = 5922

}}

|Section2={{Chembox Properties

|C=6|H=5|N=1|O=2

|Appearance = White to off-white crystalline solid

|Density = Solid

|MeltingPtC = 310

|MeltingPt_notes = (sublimes)

}}

|Section7={{Chembox Hazards

|ExternalSDS =http://datasheets.scbt.com/sc-250188.pdf

|NFPA-F = 1

|NFPA-H = 3

|NFPA-R = 0

}}

|Section8={{Chembox Related

| OtherCompounds = nicotinic acid, pyridine isoniazid

}}

}}

Isonicotinic acid or pyridine-4-carboxylic acid is an organic compound with the formula C₅H₄N(CO₂H). It is a derivative of pyridine with a carboxylic acid substituent at the 4-position. It is an isomer of picolinic acid and nicotinic acid, which have the carboxyl group at the 2- and 3-position respectively compared to the 4-position for isonicotinic acid.