6,8-dimethyl-3-phenylpyrimido[5,4-e][1,2,4]triazine-5,7-dione

4,6-dimethylthiadiazolo[4,5-d]pyrimidine-5,7-dione

8-苯基茶碱

6,8-Dimethyl-3-phenyl-1H,8H-pyrimido[4,5-e][1,3,4]thiadiazine-5,7-dione