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thiophene thiofuran thiacyclopentadiene thiole aromatic aromaticity heterocyclic heterocycle ring five-membered substitution reactions heteroatom contaminant benzene mars azeotrope oxidation alkylation desulfurization raney nickel polymerization electropolymerization coordination chemistry piano stool complexes ligand thienyl ring-fused thiophenes agrochemicals pharmaceuticals substance matter material compound component agent stuff reagent functional group precursor synthesis reaction production building block 3d molecule molecular formula skeletal structural