http://qiserver.ugr.es/cod/1537549.cif
http://qiserver.ugr.es/cod/1538617.cif
http://qiserver.ugr.es/cod/1538620.cif
http://qiserver.ugr.es/cod/1538623.cif
http://qiserver.ugr.es/cod/1538626.cif
http://qiserver.ugr.es/cod/1540181.cif