http://qiserver.ugr.es/cod/1521206.cif
http://qiserver.ugr.es/cod/1526663.cif
http://qiserver.ugr.es/cod/1530625.cif
http://qiserver.ugr.es/cod/1535817.cif
http://qiserver.ugr.es/cod/4332032.cif
http://qiserver.ugr.es/cod/7110660.cif
http://qiserver.ugr.es/cod/7708021.cif