Crystal Structure of the ER-alpha Ligand-binding Domain (Y537S) in Complex with the estradiol derivative, (8S,9S,13S,14S,E)-17-((4-isopropylphenyl)imino)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-3-ol