Crystalline solvate comprising 3-((1R,3s,5S)-3-((7-((5-methyl-1H-pyrazol-3-yl)amino)-1,6-naphthyridin-5-yl)amino-8-azabicyclo[3.2.1]octan-8-yl)propanenitrile, methanol, N-N-dimethylformamide, and water
Disclosed herein is a crystalline solvate comprising the compound of formula:methanol, N,N-dimethylformamide, and water, that is useful to prepare a crystalline form of said compound, which is an inhibitor of JAK kinases.