Upcoming Closures
Due to an inventory check, our last shipping date is December 15, 2025. Shipping will resume on January 2, 2026.
We will also be closed from December 24 - December 25.
You may still place orders online or by contacting us during this time. Thank you!
Catalog#: T1828; CAS Number: 4282-29-5 /n
Thiophene-3,4-dicarboxylic acid CAS: 4282-29-5 MDL: MFCD00067079
Building Blocks
Carboxylic Acids & Derivatives, Heterocycles
[4282-29-5]
0.98
OC(=O)C1=CSC=C1C(O)=O
172.16
C6H4O4S
Carboxy