13645-74-4
4,5-二溴-2-甲基-2H-吡嗪-3-酮
→
64178-59-2
4-溴-5-羟基-2-甲基-2H-吡嗪-3-酮
186792-13-2
4-bromo-5-methoxy-2-methyl-2H-pyridazin-3-one