http://qiserver.ugr.es/cod/1509744.cif
http://qiserver.ugr.es/cod/1520915.cif
http://qiserver.ugr.es/cod/6000381.cif
http://qiserver.ugr.es/cod/6000382.cif
http://qiserver.ugr.es/cod/6000400.cif
http://qiserver.ugr.es/cod/6000401.cif
http://qiserver.ugr.es/cod/6000402.cif