EP2493874A1 - NOVEL CRYSTALLINE FORMS OF (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