– SMD-3236 is a PRAOTAC degrader targeting SMARCA2, designed using SMARCA ligand and VHL-1 ligand, and exhibits prolonged anti-tumor activity in vivo. SMARCA2 acts as a synthetic lethal target in cancer cells lacking SMARCA4, with SMD-3236 showing 2000-fold selectivity for SMARCA2 over SMARCA4, having a DC50 of less than 1 nM and a Dmax of over 95%. In the human cancer xenograft models deficient in SMARCA4, notably the H838 model, SMD-3236 effectively induces loss of SMARCA2 in tumor tissue while sparing the SMARCA4 protein, thereby inhibiting tumor growth. The compound consists of a target protein ligand (red part) SMI-1074, a PROTAC linker (black part) (trans-4-Ethynylcyclohexyl)methyl methanesulfonate, and an E3 ligase ligand (blue part) SMARCA2 ligand-14, forming the E3LigaseLigand-linker Conjugate 159.