For the new compound of 1,2,5- selenadiazolo pyrimidine-5,7-(4H,6H) dione (SPDO),two peaks with the same mass spectra could be observed in the GC separation,which were considered to be its two isomers.

• 新化合物1；2；5-硒二唑并[3；4-d]嘧啶-5；7-(4H；6H)二酮(SPDO)在色谱柱内出现11.；83min和7