1-甲基-1,5-二氢吡唑并[3,4-D]嘧啶-4-酮

5-氯-4-乙氧羰基-1-甲基吡唑

1-甲基吡唑-4-羧酸乙酯

1-methyl-6-(2-nitrophenyl)pyrazolo[3,4-d][1,3]oxazin-4-one

(6Z)-1-methyl-6-(6-oxocyclohexa-2,4-dien-1-ylidene)-2H-pyrazolo[3,4-d][1,3]oxazin-4-one