The present Invention relates to an invention of tosylate Salt of N - [3 - [(4aR, 7aS) - 2 - amino - 4 - (5 - fluoropirimidin - 2 - il) - 4,4a 5.7 - tetrahidropirrolo [3,4-d] [1,3] tiazin - 7a - yl] - 4 - fluoro - 5 - methoxy phenyl] pyrazine-2-carboxamide.La invención presente invención se refiere a una sal de tosilato de N-[3-[(4aR,7aS)-2-amino-6-(5-fluoropirimidin-2-il)-4,4a,5,7-tetrahidropirrolo[3,4-d][1,3]tiazin-7a-il]-4-fluoro-fenil]-5-metoxi-pirazina-2-carboxamida.