Abstract
AbstractA statistical analysis of all acentric equal atom structures solved by direct methods and reported in Acta Crystallographica from January 1968 to November 1978 has been carried out. The most frequently applied direct methods programs are the MULTAN, SAP and SHELX. About 80% of all considered structures belong to the space groups P212121 and P 21. Problems with direct methods can arise if the number of the nonhydrogen atoms per asymmetric unit is greater then about 40 and/or the space group belongs to a category in which the definition of the enantiomorph is difficult.
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