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Sohncke groups

Sohncke groups are called the 65 three-dimensional space groups containing only operations of the first  kind  (rotations, rototranslations, translations). It is very generally  accepted  that enantiomerically-pure compounds (e.g. proteins) crystallize in these groups. The term comes from Leonhard Sohncke (Halle, 22 February 1842 – München, 1  November  1897), German mathematician.