CAS: 251-41-2 Molecular Formula: C6H4S2 Molecular Weight (g/mol): 140.218 MDL Number: MFCD00179479 InChI Key: VJYJJHQEVLEOFL-UHFFFAOYSA-N Synonym: thieno 3,2-b thiophene,1,4-dithiapentalene,thienothiophene,1,4-thiophthene,pubchem21292,acmc-209ghi,thieno 3,2-b thiophen,thieno 3,2-b-thiophene PubChem CID: 136063 IUPAC Name: thieno[3,2-b]thiophene SMILES: C1=CSC2=C1SC=C2