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

methyl 2-(3-(trans-2-nitrovinyl)thienyl)mercaptoacetate

methyl <(3-formylthiophene-2-yl)thio>acetate

1H-3,4,4-trioxo-2,3,3a,7b-tetrahydrothieno<2',3':5,4>thieno<2.3-c>pyrrole

3-aminomethyl-1,1-dioxo-2,3-dihydrothieno<2.3-b>thiophene-2-carboxylic acid