Crystal Structure Of The Er-Alpha Ligand-Binding Domain (L372S,L536S) In Complex With The Obhs-Bsc, 4-Bromophenyl (1R,2R,4S)-6-(4-(2-(Dimethylamino)Ethoxy)Phenyl)-5-(4-Hydroxyphenyl)-7-Oxabicyclo[2.2.1]Hept-5-Ene-2-Sulfonate