A racemic strigol analogue at 100K
Rugutt, Joseph K.; Fronczek, Frank R.; Yarabe, Houphouet H.; Shamsi, Shahab A.; Henry III, Charles W.; Billiot, Eugene J.; Warner, Isiah M.; Acta Crystallographica Section C 55 (1999) 759–761; doi:10.1107/S0108270199001341

data_2008520
_publ_section_title
;
 A racemic strigol analogue at 100K
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              759
_journal_page_last               761
_journal_paper_doi               10.1107/S0108270199001341
_journal_volume                  55
_journal_year                    1999
_chemical_formula_moiety         'C13 H12 O5'
_chemical_formula_sum            'C13 H12 O5'
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_chemical_melting_point          407
_chemical_name_systematic
;
dl-3-[[2,5-dihydro-3-methyl-2-oxo-5-furanyl]oxo]methylene-3,3a,6,6a-
tetrahydro-2H-cyclopenta[b]furan-2-one
;
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_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details     'w = 4Fo^2^/(\s^2^(Fo^2^) + 0.0004 Fo^4^)'
_refine_ls_weighting_scheme      calc
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_refine_ls_wR_factor_obs         .055
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_cod_data_source_file            sx1062.cif
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_cod_depositor_comments
;
The following automatic conversions were performed:

'_atom_site_thermal_displace_type' tag value 'Uij' was replaced with
'Uani' value 18 times.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value '4Fo^2^/(\s^2^(Fo^2^) + 0.0004
Fo^4^)' was changed to 'calc'. New tag '_refine_ls_weighting_details'
was created. The value of the new tag was set to 'w =
4Fo^2^/(\s^2^(Fo^2^) + 0.0004 Fo^4^)'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1142.0(10)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2008520