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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 77694Generated: October 23, 2026

2-Thiopheneglyoxylic acid

2-thioylformic acid · RARECHEM AL BO 2203 · 2-Thiopheneglyoxylic · 2-THIENYLGLYOXYLIC ACID · 2-Thienylglyoxalic acid · a-Thienylglyoxalic acid · 2-THIOPHENEGLYOXYLIC ACID · (2-Thienyl)oxoacetic acid

https://huagongshe.com/en/chemical/77694

2-Thiopheneglyoxylic acid molecular structure

Identifiers & Physical Properties

CAS No.4075-59-6
Molecular formulaC6H4O3S
Average molar mass156.16 g/mol
Monoisotopic mass155.98811499 g/mol
SMILESO=C(O)C(=O)c1cccs1
InChIKeyGIWRVUADKUVEGU-UHFFFAOYSA-N
PubChem CID77694
ChEMBLCHEMBL294445
EC No.223-794-2
DTXSIDDTXSID90193733

Chemical & Physical Properties

XLogP1.1
Topological polar surface area82.6
Hydrogen bond donors1
Hydrogen bond acceptors4
Rotatable bonds2
Heavy atoms10
Formal charge0
Complexity166
Melting point88-91 °C (lit.)
Boiling point250.38°C (rough estimate)
Density1.404 (estimate)
Refractive index1.5151 (estimate)
Storage conditionsunder inert gas (nitrogen or Argon) at 2–8 °C
Physical statesolid
pKa (acidity coefficient)2.09±0.54(Predicted)
SensitivityHygroscopic
BRN115791
InChI1S/C6H4O3S/c7-5(6(8)9)4-2-1-3-10-4/h1-3H,(H,8,9)
InChIKeyGIWRVUADKUVEGU-UHFFFAOYSA-N
SMILESOC(=O)C(=O)c1cccs1
CAS DataBase Reference4075-59-6(CAS DataBase Reference)
FDA UNII723A77PV2M
UNSPSC Code12352100
NACRESNA.22
GHS pictogramGHS05
Signal wordDanger
GHS hazard statementsH314
GHS precautionary statementsP260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P363
Personal protective equipment (PPE)Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
Hazard symbolsC,Xi
Risk statements (R)34
Safety statements (S)26-27-28-36/37/39-45
UN transport numberUN 3261 8/PG 2
Water hazard class (WGK)3
Hazard NoteIrritant
Hazard class8Eye Dam. 1Skin Corr. 1B
Packing groupIII
Customs code29349990
Storage class8A - Combustible corrosive hazardous materials

Safety & Regulations

GHS classificationDangerH314 (100%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]P260, P264, P264+P265, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P363, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 43 reports by companies from 2 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesSkin Corr. 1B (100%)
Personal protective equipment (PPE)Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
Water hazard class (WGK)3
UN transport numberUN 3261 8/PG 2
Customs code29349990
Risk statements (R)34
Signal wordDanger
GHS pictogramGHS05
Hazard symbolsC,Xi
hazard_noteIrritant
Safety statements (S)26-27-28-36/37/39-45
Hazard class8Eye Dam. 1Skin Corr. 1B
Storage class8A - Combustible corrosive hazardous materials
Packing groupIII
GHS hazard statementsH314
GHS precautionary statementsP260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P363

Applications & Uses

Uses

2-Thiopheneglyoxylic acid was used in the synthesis of europium complexes.