http://qiserver.ugr.es/cod/2100897.cif
http://qiserver.ugr.es/cod/2100900.cif
http://qiserver.ugr.es/cod/2100901.cif
http://qiserver.ugr.es/cod/2106841.cif
http://qiserver.ugr.es/cod/8103533.cif
http://qiserver.ugr.es/cod/9017457.cif