41739-23-5
1,1-二氟乙酰基乙酮
→
438218-14-5
7-二氟甲基-5-甲基-吡唑并-[1,5-a]嘧啶-3-羧酸
438218-16-7
ethyl 7-(difluoromethyl)-5-methylpyrazolo[1,5-a]pyrimidine-3-carboxylate