This invention relates to crystalline (1S,2S,3S,5R)-3-((6-(difluoromethyl)-5-fluoro-1,2,3,4-tetrahydroisoquinolin-8-yl)oxy)-5-(4-methyl-7H-pyrrolo[2,3-d]pyrimidin-7-yl)cyclopentane-1,2-diol monophosphate hydrate, and to compositions and therapeutic uses thereof.Cette invention concerne l'hydrate de (1S,2S,3S,3S,5R)-3-((6- (difluorométhyl)-5-fluoro-1,2,3,4-tétrahydroisoquinolin-8-yl) oxy)-5-(4-méthyl-7H-pyrrolo[2,3-d]pyrimidin-7-yl)cyclopentane-1,2-diol-monophosphate, et leurs compositions et leurs utilisations thérapeutiques.