Characterization of Orally Active Nonpeptide Vasopressin V2 Receptor Agonist. Synthesis and Biological Evaluation of Both the (5R)- and (5S)-Enantioisomers of 2-1-(2-Chloro-4-pyrrolidin-1-yl-benzoyl)-2,3,4,5-tetrahydro-1H-1-benzazepin- 5-yl-N-isopropylacetamide