http://qiserver.ugr.es/cod/1511520.cif
http://qiserver.ugr.es/cod/1539020.cif
http://qiserver.ugr.es/cod/1539447.cif
http://qiserver.ugr.es/cod/1541129.cif
http://qiserver.ugr.es/cod/1541130.cif
http://qiserver.ugr.es/cod/9012924.cif