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