| abstract |
The present invention provides individual crystalline polymorphs of ( S )-1- (4,4,6, 6,6-pentadeutero-5-hydroxyhexyl)-3,7 -dimethyl- 1H-purine-2,6(3H,7H)-dione designated Form 1, Form 2, Form 3 and Form 4. Each polymorph disclosed herein is characterized according to one or more of (a) powder X-ray diffraction data ("XRPD"); (b) differential scanning calorimetry ("DSC"); and (e) thermo gravimetric analysis (TGA). |