Dear Bernhard,

CCP4 has an alternative command-line tool for this; less tested but
happens to preserve P 21 2 21:
gemmi cif2mtz input.cif output.mtz

Marcin

On Wed, 6 Jan 2021 at 20:39, Bernhard Rupp <hofkristall...@gmail.com> wrote:
>
> Dear Developers,
>
>
>
> running cif2mtz in ccp4i (or from the console) in the case of non-standard 
> settings of space group 18 (which should be discouraged, to phrase it mildly)
>
> on the mmcif from the PDB
>
> _symmetry.space_group_name_H-M   "P 21 2 21" ß
>
> _symmetry.Int_Tables_number      18
>
> #
>
>
>
> leads to a problem because the resulting mtz file has the standard 18 symbol
>
>
>
> Type      Merged MTZ
>
> Space group       P 21 21 2 ß
>
> Space group confidence                X  (confidence flag is not set)
>
> Cell         88.578  44.416  71.564        90      90      90
>
>
>
> Not sure if this is a loss of information when generating the mmcif upon 
> submission,
>
> or the SG is retrieved solely by SG number not symbol (the latter can give 
> rise to a few more such situations).
>
>
>
> Best, BR
>
>
>
> ------------------------------------------------------
>
> Bernhard Rupp
>
> http://www.hofkristallamt.org/
>
> b...@hofkristallamt.org
>
> +1 925 209 7429
>
> +43 676 571 0536
>
> ------------------------------------------------------
>
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>
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>
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>
>
>
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