http://qiserver.ugr.es/cod/1521250.cif
http://qiserver.ugr.es/cod/1521651.cif
http://qiserver.ugr.es/cod/1521652.cif
http://qiserver.ugr.es/cod/1521653.cif
http://qiserver.ugr.es/cod/1521991.cif
http://qiserver.ugr.es/cod/1521992.cif
http://qiserver.ugr.es/cod/1521993.cif
http://qiserver.ugr.es/cod/1521994.cif