Crystal Structure of the ER-alpha Ligand-binding Domain (Y537S) in Complex with the OBHS-ASC Analog, 5-(4-((1R,4S,6R)-6-((3-chlorophenoxy)sulfonyl)-3-(4-hydroxyphenyl)-7-oxabicyclo[2.2.1]hept-2-en-2-yl)phenoxy)pentanoic acid