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(a) Structures of NBN-doped helicenes. Thermal ellipsoids are shown at 50% probability; only (P)-enantiomers are shown, and hydrogen atoms are omitted for clarity. (b) Molecular packing in the crystals of NBN-doped helicenes. Carbon atoms of (P)-enantiomers are colored in orange and light green, and carbon atoms of (M)-enantiomers are colored in gray.
