6-(hydroxyamino)-1,3-dimethylpyrimidine-2,4-dione

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

1,2-二甲基环己烯

1-甲基-2-亚甲基环己烷

2-溴-3-甲基-2-丁烯