Pyridazine derivative and application thereof in medicine

The invention relates to a compound shown in a general formula (I) or a stereoisomer, a deuterated compound, a solvate, a prodrug, a metabolite, a pharmaceutically acceptable salt or a co-crystal of the compound, an intermediate of the compound, and application of the compound in SMARCA related diseases such as cancers. And B-L-K (I). 本发明涉及一种通式(I)所述的化合物或者其立体异构体、氘代物、溶剂化物、前药、代谢产物、药学上可接受的盐或共晶，及其中间体，以及在SMARCA相关疾病如癌症中的用途。B-L-K(I)。