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The crystal structures of 1,6-diazabicyclo[4.4.4]tetradecane (1) and of its inside-protonated ion (2), which were originally described in space group C2/c, should be described instead in trigonal space groups, (1) in Rc and (2) in Pc; both moieties have crystallographically imposed point symmetry D3 rather than C2.

1,6-Diazabicyclo[4.4.4]tetradecane and its inside-protonated ion: changes in space groups