There are four single bonds in each molecule, giving rise to a quite significant amount of 2 4 = 16 conformations by rotation, which finally get reduced by symmetry arguments to 10 nonequivalent molecular conformations (only flat, fully delocalized structures were taken into account at this stage).
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Exploring the Photocyclization Pathways of Styrylthiophenes in the Synthesis of Thiahelicenes: When the Theory and Experiment Meet.
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