CRYSTAL STRUCTURE OF THE ER-ALPHA LIGAND-BINDING DOMAIN IN COMPLEX WITH A SULFOXIDE-BRIDGED OXABICYCLIC HEPTENE SULFONATE (SOBHS)-2 ANALOG PHENYL (1S,2S,4S,7S)-5,6-BIS(4-HYDROXY-2-METHYLPHENYL)-7- THIABICYCLO[2.2.1]HEPT-5-ENE-2-SULFONATE 7-OXIDE