http://qiserver.ugr.es/cod/1520920.cif
http://qiserver.ugr.es/cod/1521316.cif
http://qiserver.ugr.es/cod/1521404.cif
http://qiserver.ugr.es/cod/1521405.cif
http://qiserver.ugr.es/cod/9009956.cif
http://qiserver.ugr.es/cod/9009957.cif