EP2986609A1 - PHARMACEUTICAL FORMULATIONS, PROCESSES, SOLID FORMS AND METHODS OF USE RELATING TO 1-ETHYL-7-(2-METHYL-6-(1H-1,2,4-TRIAZOL-3-YL) PYRIDIN-3-YL) -3,4-DIHYDROPYRAZINO[2,3-B]PYRAZIN-2(1H)-ONE