1-氧化二苯基二氮烯

3-(4-methoxy-phenyl)-5,7-dimethyl-7H-isoxazolo[3,4-d]pyrimidine-4,6-dione

偶氮甲烷

1,3,6,8-tetramethylpyrimido[4,5-g]pteridine-2,4,7,9-tetrone

3,5,7-trimethyl-[1,2]oxazolo[3,4-d]pyrimidine-4,6-dione