HCID 185263683-溴-7-羟基吡唑并[1,5-A]嘧啶-6-羧酸乙酯Ethyl 3-bromo-7-oxo-1,7-dihydropyrazolo[1,5-a]pyrimidine-6-carboxylate · CAS 43024-63-1 · CID 18526368 · C9H8BrN3O3