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Information card for entry 2001394
Preview
| Coordinates | 2001394.cif |
|---|---|
| Original IUCr paper | HTML |
| External links | PubChem |
| Formula | C8 H14 Cl N O3 |
|---|---|
| Calculated formula | C8 H14 Cl N O3 |
| Title of publication | Structures of 3-hydroxy-1-(2-methoxyethyl)-2-methyl-4-pyridinone, its hydrochloride and 1-ethyl-3-hydroxy-2-methyl-4-pyridinone hydrochloride hydrate |
| Authors of publication | Xiao, G.; van der Helm, D.; Goerlitz, F. H.; Hider, R. C.; Dobbin, P. S. |
| Journal of publication | Acta Crystallographica Section C |
| Year of publication | 1993 |
| Journal volume | 49 |
| Journal issue | 9 |
| Pages of publication | 1646 - 1649 |
| a | 6.6361 ± 0.0004 Å |
| b | 17.115 ± 0.001 Å |
| c | 9.1024 ± 0.0005 Å |
| α | 90° |
| β | 98.473 ± 0.005° |
| γ | 90° |
| Cell volume | 1022.54 ± 0.1 Å3 |
| Cell temperature | 138 ± 2 K |
| Number of distinct elements | 5 |
| Space group number | 14 |
| Hermann-Mauguin space group symbol | P 1 21/c 1 |
| Hall space group symbol | -P 2ybc |
| Residual factor for significantly intense reflections | 0.035 |
| Weighted residual factors for significantly intense reflections | 0.047 |
| Goodness-of-fit parameter for significantly intense reflections | 1.77 |
| Diffraction radiation wavelength | 1.54178 Å |
| Diffraction radiation type | CuKα |
| Has coordinates | Yes |
| Has disorder | No |
| Has Fobs | No |
| Revision | Date | Message | Files |
|---|---|---|---|
| 301791 (current) | 2025-08-19 | Add cross-references to PubChem compounds in COD range 2/00 Each referenced PubChem compound corresponds to the full crystal structure. |
2001394.cif |
| 277834 | 2022-09-14 | cif/ Added space group information derived from the space group operation list using the 'cif_filter' program. |
2001394.cif |
| 176435 | 2016-02-14 | cif/ (antanas@kurmis) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries from ranges 1, 2. |
2001394.cif |
| 134621 | 2015-04-02 | The 'cif_fix_values' script with an option '--fix-only-weighting-scheme' and 'cif_filter' script were run over CIF files which included an incorrect value of the data item '_refine_ls_weighting_scheme'. Read the log for more details. There were more than 18k CIF files with values to modify. Usually these incorrect values include comment with formulas, but values of this data item must be an enumerator. The script creates new data item '_refine_ls_weighting_details' to store these comments with formulas, and writes the enumerator 'calc' as a value of data item '_refine_ls_weighting_scheme'. There exists some exceptions in the script. |
2001394.cif |
| 117801 | 2014-06-18 | cif/2/00/13/ (saulius@koala.ibt.lt) Commenting out extra symmetry operators from 2001394.cif. |
2001394.cif |
| 91933 | 2013-12-28 | cif/ (saulius@koala.ibt.lt) Adding DOIs that could be assigned unambiguously to the range 2x CIFs. |
2001394.cif |
| 32112 | 2012-02-03 | cif/: committing an update of 45+ thous files, with information appended from the originals. | 2001394.cif |
| 26848 | 2011-09-28 | cif/2/, hkl/2/, html/ Reorganising CIFs of the range 2* into the "prefix-directory" tree. |
2001394.cif |
| 26029 | 2011-09-17 | cif/2/ Reverting changes of revision 25271: ( cd cif/2/; svn merge -r25271:25270 . ) The problem was that the reprocessed files from IUCr, although were more complete, "resurrected" data errors that were corrected in the previous recisions. The additional data that have been extracted during the reprocessing will have to be merged without overwriting the existing values in COD files, except some explicit and controlled cases (such as publication titles and chemical names). |
2001394.cif |
| 25271 | 2011-09-10 | cif/2/ Adding reporocessed IUCr CIFs for the years 1980-2010. The CIFs now contain more complete bibliography, substance names, correctly unfolded text fields (using the CIF line unfolding protocol), explicitely set cell angles, and _cod_data_source_block fields. |
2001394.cif |
| 966 | 2010-01-30 | cif/ Adding _cod_database_code tags to all COD entries. Adding tag description to the cif_cod.dic dictionary so that COD entries can be validated. |
2001394.cif |
| 858 | 2009-11-18 | cod/cif/ Changing all _chemical_formula_sum values, were necessary, to conform IUCr recommended syntax and sorting order. After this operation, it will be easier to search for structures using the _chemical_formula_sum values. Only those files and thos lines that really needed to be changed were changed; otehrwise the CIFs were not reformatted. The procedure was as follows: first, all files were passed through a 'cif_filter --parse-formula-sum' command, and the lines containing _cif_formula_sum matching tags were extracted. The extracted tags were "spliced" into the CIF files using the ./bin/{un,}grepciftag commands and awk to filter out old tags and add new tags in their place; the replacement was only done if the new tags contained "_cod_" tags ('grep -q _cod_ tmp-$$'), indicating that cif_filter has altered the formula, or the original file did not contain the _chemical_formula_sum tag ('! grep -q _chemical_formula_sum X'), indicating that cif_filter has guessed the chemical_formula_sum from the file (which should not have happened, actually). If the file was different, disregarding spaces, from the original one ('if ! diff -wb X tmp2-$$'), the original was replaced by the new file, to be committed to the repository. The full command for this step was: ( \ set -x; \ find ? -name \*.cif \ | xargs -n1 -iX \ sh -c 'cif_filter --parse-formula-sum X \ | ./bin/grepciftag _chemical_formula_sum > tmp-$$; \ if grep -q _cod_ tmp-$$ || ! grep -q _chemical_formula_sum X; \ then \ awk "/^#/,/_chemical_formula_sum/{print} /_chemical_formula_sum/{exit}" X \ | ./bin/ungrepciftag _chemical_formula_sum > tmp2-$$; \ cat tmp-$$ >> tmp2-$$; \ awk "/_chemical_formula_sum/,/\$eof/" X \ | ./bin/ungrepciftag _chemical_formula_sum >> tmp2-$$; \ if ! diff -wb X tmp2-$$; \ then \ mv -fv tmp2-$$ X; \ fi; \ fi; \ rm -f tmp-$$ tmp2-$$' \ ) >& sort-chemical-formulae-2009.11.16.log Next, the files were searched that differ from their originals only by the order of CIF tags: svn st \ | awk '/^M/{print $NF}' \ | sort | xargs -n1 -iX \ bash -c 'if diff -q <(svn cat X|sort) <(sort X) >& /dev/null; \ then echo X; \ fi' \ >& only-reordered.lst These files, after manual inspection ('cat only-reordered.lst | xargs svn diff | less'), were reverted to the originals: cat only-reordered.lst | xargs svn revert Finally, a syntax check was performed using 'vcif': svn st | awk '/^M/{print $NF}' \ | sort | xargs -n1 -iX \ sh -c 'echo -n X"\r"; vcif -l 2048 X || { echo == X == ; echo X >&2; }' \ 2> vcif-check-2009.11.18.err A check on the whole COD archive showed the same files as recorded in vcif-check-2009.11.18.err: find ? -name \*.cif \ | sort \ | xargs -n1 -iX \ sh -c 'echo -n X"\r"; \ vcif -l 2048 X || { echo == X == ; echo X >&2; }' \ 2> vcif-all-check-`-date`.err diff vcif-check-2009.11.18.err vcif-all-check-2009.11.18.err Since no differences were detected in between vcif-check-2009.11.18.err and vcif-all-check-2009.11.18.err, the latter was deleted and is not committed. The check reveled two broken files, 2/2000267.cif and 2/2001000.cif; these were corrected manually. Afther this, one more 'vcif' check showed no syntax errors, and the changes are committed into the COD repository. 19798 files have modifications in this commit, according to svn st | grep '^M' | wc -l |
2001394.cif |
| 665 | 2009-04-21 | Redepositing COD files reprocessed in the Acta-Cryst-C-1991-1993-redeposition/ directory. Although all structures were present in COD already, this redeposition enhances and improves the deposited files in several aspects: 1) full bibliographies, with diacrytic marks, are added from the IUCr BibTeX files; 2) chemical formula information is checked and fixed were necessary; 3) symmetry operators were checked for syntactic correctness, fixed were necessary, and spacegroup information was derived from these operators whenever possible; the original spacegroup was checked against the determined spacegroup and the differences were marked if present; 4) missing cell constants were restored, 5) at least in one entry, corrent coordinates were restored, 6) in entries where problems were detected, _code_depositor_comments and _cod_error_... tags were added, 7) information necessary to generate Acta Cryst. paper back-links was added, and the comment header agreed with IUCr was inserted. |
2001394.cif |
| 610 | 2009-04-03 | Removing duplicated _journal_name_full tags from the 2/200139[234].cif files. |
2001394.cif |
| 491 | 2008-11-24 | Fixing last formulas and bibliographies in the 2* series in the CIFs deposited from Acta-Cryst-C-1991-1993 publications, so that the structures can be automatically recognised and matched against the new depositions. |
2001394.cif |
| 19 | 2008-01-26 | Changing all end-of-line codes from DOS style to UNIX style in all COD CIF files, for more convenient processing: In the cod/cif/ directory: ff \*.cif | xargs perl -i -pe 's/\r\n/\n/' |
2001394.cif |
| 14 | 2008-01-14 | Appending a header with SVN keywords, COD URL and copying policy to all COD CIF files. |
2001394.cif |
| 13 | 2008-01-13 | Setting the svn:keywords property to "Author Date Revision URL Id" for all CIF files in the cod/cif directory. |
2001394.cif |
| 1 | 2007-11-30 | Adding all .cif files from the COD, downloaded in a Cod.zip file on 2007.02.07 (and the same Cod.zip is downloadable today, on 2007.11.29) |
2001394.cif |
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Users of the data should acknowledge the original authors of the
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