Estrogen Receptor Alpha Ligand Binding Domain Y537S Mutant In Complex With (6'-Hydroxy-1'-(4-((1-Propylazetidin-3-Yl)Methoxy)Phenyl)-1',4'-Dihydro-2'H-Spiro[Cyclopropane-1,3'-Isoquinolin]-2'-Yl)(Phenyl)Methanone