This application relates to (2R, 5S, 13ar) - 7.9 - [- 10 - (2,4,6 - trifluorobencil) Carbamoyl) - 2,3,4,5,7,9,13,13a - octahidro - 2.5 - 4.5: metanopirido [1,2] pirazino [2,1-b] [1.3] oxazepin - 8 - olato Sodium form I. claim 1: a compound of the formula (1).La presente solicitud se relaciona con (2R,5S,13AR)-7,9-dioxo-10-((2,4,6-trifluorobencil)carbamoil)-2,3,4,5,7,9,13,13a-octahidro-2,5-metanopirido[1,2:4,5]pirazino[2,1-b][1,3]oxazepin-8-olato de sodio Forma I. Reivindicación 1: Un compuesto de la fórmula (1).