5-(methoxycarbonyl)thieno<2,3-b>thiophene-2-sulfonyl chloride

methyl trans-1,1-dioxo-3-nitromethyl-2,3-dihydrothieno<2.3-b>thiophene-2-carboxylate

2-<1-<(2-methoxyethyl)amino>ethyl>thieno<2,3-b>thiophene

5-{[Bis-(2-hydroxy-ethyl)-amino]-methyl}-thieno[2,3-b]thiophene-2-sulfonic acid amide

5-carbamoyl>thieno<2,3-b>thiophene-2-sulfonamide