E3 Ligase Ligand-linker Conjugate 147 is a conjugate of E3 ligase ligand and PROTAC Linker, which can be used to synthesize BRD9 Degrader-1 (Compound 13-7). E3 Ligase Ligand-linker Conjugate 147 is composed of the E3 ligase ligand BRD9 ligand-7 and the PROTA linker 2-((1R,5S,6s)-3-Azabicyclo[3.1.0]hexan-6-yl)ethan-1-ol.