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Synthesis and 3D representations of symmetrical bis-alkynyl derivative 141. Hydrogen atoms are omitted for clarity. Thermal ellipsoids are set at 30% probability. ’ = 1 − x, 1 − y, z; ’’ = y, 1 − x, −z; ’’’ = 1 − y, x, −z. (Reproduced with permission from ref. [180]. Copyright 2016 the Royal Society of Chemistry.).
