prov:value
| - One particularly preferred class of thiophenes is that of 3,4-ethylenedioxythiophenes, of the general formula (shown in the reduced form), wherein each of R1, R2, R3, and R4, independently of the others, is a hydrogen atom, an alkyl group, including linear, branched, saturated, unsaturated, cyclic, and substituted alkyl groups, typically with from 1 to about 20 carbon atoms and preferably with fro
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