text: There is no space group restriction for the crystallization of racemic compound crystallizing either in centrosymmetric or in non-centrosymmetric space group (SG). The frequency of organic racemic compounds in the Cambridge Structural Database is summarized in the following table:  
  Kryptoracemic compounds are thus very rare and represent circa 1% of the racemic compounds. The frequency of kryptoracemic compounds in the whole organic Cambridge Structural Database was estimated to circa 0.4% to 0.8%.
  A review covering organometallic compounds with a stereogenic metal atom sorted a list of 26 possible kryptoracemic compounds.