Use of software to search for higher symmetry: space group C2

From a search of the October 2000 release of the Cambridge Structural Datab ase we rnd coordinate data for approximately 1500 entries under space group No. 5: C2 or, occasionally, A2, I2 or B112. Software designed to detect ca ses of missed higher symmetry identified 144 entries for detailed inspectio n. Of these, 50 should, we believe, be revised to space groups of higher sy mmetry. The most common revision is to space group C2/m, which entails addi ng a center of inversion and usually results in important changes in bond l engths and angles.