Increasing The Efficiency Efficiency Of Ligands For The Fk506-Binding Protein 51 By Conformational Control: Complex Of Fkbp51 With 2-(3,4-Dimethoxyphenoxy)Ethyl (2S)-1-[(2-Oxo-2,3-Dihydro-1,3-Benzothiazol-6-Yl)Sulfonyl]Piperidine-2-Carboxylate