Increasing The Efficiency Efficiency Of Ligands For The Fk506-Binding Protein 51 By Conformational Control: Complex Of Fkbp51 With Compound 1-[(9S,13R,13Ar)-1,3-Dimethoxy-8-Oxo-5,8,9,10,11,12,13,13A-Octahydro-6H-9,13-Epiminoazocino[2,1-A]Isoquinolin-14-Yl]-2-(3,4,5-Trimethoxyphenyl)Ethane-1,2-Dione