A solid form of a compound of the formula (I) ** Formula ** characterized by an XRPD diagram containing at least one XRPD peak within the range of 2-theta diffraction angles (CuKα) from 10.3 ° to 13, 3rd, said solid form is (1,1-dioxo-1λ6-thiomorpholin-4-yl) - {6- [3- (4-fluorophenyl) -5-methyl-isoxazol-4-ylmethoxy] -pyridin-3- il} - methanone in anhydrous polymorphic form C, characterized by an XRPD diagram containing XRPD peaks at the 2-theta diffraction angles (CuKα) of 17.4 ° + - 0.2 ° and 23.4 ° + - 0.2 °.Una forma sólida de un compuesto de la fórmula (I)**Fórmula** caracterizada por un diagrama XRPD que contiene por lo menos un pico XRPD dentro del intervalo de ángulos de difracción 2-theta (CuKα) de 10,3º a 13,3º, dicha forma sólida es la (1,1-dioxo-1λ6-tiomorfolin-4-il)-{6-[3-(4-fluorfenil)-5-metil-isoxazol-4-ilmetoxi]-piridin-3-il}- metanona en forma polimórfica anhidra C, caracterizada por un diagrama XRPD que contiene picos XRPD en los ángulos de difracción 2-theta (CuKα) de 17,4º +- 0,2º y 23,4º +- 0,2º.
