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Polystyrene has a chain where the substituent R is a phenyl group (C6H5), corresponding to a benzene ring minus one hydrogen: -CH2-CH(C6H5)n-, so the repeat unit is -CH2-CH(C6H5)n-.
The λ5-iodanes such as the Dess-Martin periodinane have square pyramidal geometries with 4 heteroatoms in basal positions and one apical phenyl group.