Patent ID: 8202864

Claim:
(3R,6R)-3-(2,3-dihydro-1H-inden-2-yl)-1-[(1R)-1-(2,6-dimethyl-3-pyridinyl)-2-(4-morpholinyl)-2-oxoethyl]-6-[(1S)-1-methylpropyl]-2,5-piperazinedione or a pharmaceutically acceptable salt thereof wherein said pharmaceutically acceptable salt is an acid addition salt where the acid is selected from hydrochloric, hydrobromic, nitric, phosphoric, sulphuric, methanesulphonic, ethanesulphonic, benzenesulphonic, p-toluenesulphonic, citric, tartaric, lactic, pyruyic, acetic, succinic, fumaric and maleic acid.