scripts/sdf_add_cod_data: tests/inputs/sdf_add_cod_data/cif/Fe-no-source-block-name.cif data_0000002: WARNING, data item '_cod_database_code' was not found -- database identifier will be determined from the '_cod_data_source_block' data item.
scripts/sdf_add_cod_data: tests/inputs/sdf_add_cod_data/cif/Fe-no-source-block-name.cif data_0000002: WARNING, data item '_cod_data_source_block' was not found -- database identifier will set to '?'.
Fe
Tester

 1   0  0  0  0  0  0  0  0  0999 V2000
         0         0         0 Fe  0  0  0  0  0  0  0  0  0  0  0  0
M  END
> <PUBCHEM_EXT_DATASOURCE_REGID>
?

> <PUBCHEM_SUBSTANCE_SYNONYM>
Iron

> <PUBCHEM_SUBSTANCE_COMMENT>
Surname, Name; Lastname, Firstname, (2022), Title, Journal, 1, 7, 2000-2001. https://doi.org/10.5555/12345678

> <PUBCHEM_EXT_DATASOURCE_URL>
https://www.crystallography.net/cod/

> <PUBCHEM_EXT_SUBSTANCE_URL>
https://www.crystallography.net/cod/?.html

$$$$
