http://qiserver.ugr.es/cod/1520804.cif
http://qiserver.ugr.es/cod/1521232.cif
http://qiserver.ugr.es/cod/1521245.cif
http://qiserver.ugr.es/cod/1521247.cif
http://qiserver.ugr.es/cod/1522183.cif
http://qiserver.ugr.es/cod/1522287.cif
http://qiserver.ugr.es/cod/1522289.cif