EP3063151B1 - A Stable Polymorph of the Salt of (2r)-4-Oxo-4-[3-(trifiuoromethyl)-5,6- Dihydro[l,2,4]triazolo[4,3-A]pyrazin-7(8h)-Yl]-L-(2,4,54rifluorophenyl)butan-2-Amine with L-Tartaric Acid