http://qiserver.ugr.es/cod/1521708.cif
http://qiserver.ugr.es/cod/1521709.cif
http://qiserver.ugr.es/cod/1521886.cif
http://qiserver.ugr.es/cod/1521887.cif
http://qiserver.ugr.es/cod/6000235.cif