5,7,8-三甲基-2-氧杂-8,9-二氮杂双环[4.3.0]壬-4,6,9-三烯-3-酮

1,3,4-trimethylpyrano[2,3-c]pyrazol-6-one

2-ethyl-3,4-dimethylpyrano[2,3-c]pyrazol-6-one

1-ethyl-3,4-dimethylpyrano[2,3-c]pyrazol-6-one

3,4-dimethyl-1-propylpyrano[2,3-c]pyrazol-6-one