Solid forms of N-(4-fluoro-3-(6-(3-methylpyridin-2-yl)-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)phenyl)-2,4-dimethyloxazole-5-carboxamide

A co-crystal comprising N-(4-fluoro-3-(6-(3-methylpyridin-2-yl)[2,4]triazolo[1,5- a]pyrimidin-2-yl)phenyl)-2,4-dimethyloxazole-5-carboxamide and fumaric acid;

• wherein said co-crystal is characterized by:
• (i) an X-ray powder diffraction pattern comprising three or more 2θ peaks selected from 24.7°±0.2°, 23.9°±0.2°, 16.0°±0.2° (2θ) and 13.4°±0.2° (2θ);
• (ii) an X-ray powder diffraction pattern comprising three or more three or more 2θ peaks selected from 27.6°±0.2°, 14.8°±0.2°, 9.8°±0.2°, 11.3°±0.2°, 24.6°±0.2°, 25.0°±0.2° and 26.5°±0.2° (2θ);
• or
• (iii) an X-ray powder diffraction pattern comprising three or more 2θ peaks selected from 13.5°±0.2°, 3.8°±0.2°, 17.2°±0.2°and 26.6°±0.2 (2θ);
• when measured with a CuKα radiation at a wavelength of 0.15 nm at room temperature.