Back
HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 304271Generated: October 23, 2026

4-Thiazolecarboxylic acid

THIAZOLE-4-CARBOXYLIC ACID · 3973/8/8 · NSC 195467 · AKOS BB-9161 · 4-CARBOXYTHIAZOLE · TIMTEC-BB SBB010166 · 4-Carboxy-1,3-thiazole · 4-THIAZOLECARBOXYLIC ACID

https://huagongshe.com/en/chemical/304271

4-Thiazolecarboxylic acid molecular structure

Identifiers & Physical Properties

CAS No.3973-08-8
Molecular formulaC4H3NO2S
Average molar mass129.14 g/mol
Monoisotopic mass128.98844934 g/mol
SMILESO=C(O)c1cscn1
InChIKeyHMVYYTRDXNKRBQ-UHFFFAOYSA-N
PubChem CID304271
ChEMBLCHEMBL1236484
EC No.628-056-7
DTXSIDDTXSID30307857

Chemical & Physical Properties

XLogP0.8
Topological polar surface area78.4
Hydrogen bond donors1
Hydrogen bond acceptors4
Rotatable bonds1
Heavy atoms8
Formal charge0
Complexity106
DrugsPharmaceuticals -> Listed in ZINC15
Melting point195-199 °C (lit.)
Boiling point191 °C
Density1.525±0.06 g/cm3(Predicted)
Storage conditions2-8°C
SolubilityDMSO (Slightly), Methanol (Slightly)
Physical stateSolid
pKa (acidity coefficient)3.57±0.10(Predicted)
ColorWhite to Off-White
λmax230nm(EtOH)(lit.)
InChIInChI=1S/C4H3NO2S/c6-4(7)3-1-8-2-5-3/h1-2H,(H,6,7)
InChIKeyHMVYYTRDXNKRBQ-UHFFFAOYSA-N
SMILESS1C=C(C(O)=O)N=C1
CAS DataBase Reference3973-08-8(CAS DataBase Reference)
FDA UNIIUE1ZOP7MLZ
UNSPSC Code12352100
NACRESNA.22
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH317
GHS precautionary statementsP280
Personal protective equipment (PPE)dust mask type N95 (US), Eyeshields, Faceshields, Gloves
Hazard symbolsXi
Risk statements (R)43
Safety statements (S)36/37
Water hazard class (WGK)3
Hazard classIRRITANTSkin Sens. 1
Customs code29341000
Storage class11 - Combustible Solids

Safety & Regulations

GHS classificationWarningH315 (13%): Causes skin irritation [Warning Skin corrosion/irritation]P261, P264, P264+P265, P271, P272, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P333+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 46 reports by companies from 8 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesSkin Irrit. 2 (13%)
Personal protective equipment (PPE)dust mask type N95 (US), Eyeshields, Faceshields, Gloves
Water hazard class (WGK)3
Customs code29341000
Risk statements (R)43
Signal wordWarning
GHS pictogramGHS07
Hazard symbolsXi
Safety statements (S)36/37
Hazard classIRRITANTSkin Sens. 1
Storage class11 - Combustible Solids
GHS hazard statementsH317
GHS precautionary statementsP280

Applications & Uses

Uses

4-Thiazolecarboxylic Acid (cas# 3973-08-8) is a compound useful in organic synthesis.