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computer programs
A Fortran CRYSTAL STRUCTURE UTILITY (CSU) batch program for the analysis of X-ray crystal structures is described. Both mainframe and IBM PC/XT compatible computer versions are available. CSU provides, through a free-format-free-sequence input, automatic hydrogen modelling and search of chemical connectivity relationships, taking into consideration not only crystallographic symmetry, but also internal molecular symmetry. The program prints clear ready-for-publication tables free of redundant data. It enables data transfer from/to other programs such as XRAY76, SHELX76, $SYST$, ORTEP or MOLDRAW, but also it is possible to communicate with almost any other program used in small-molecule crystallography.