2-​Pyridinecarboxamide, N-​[4-​[(3R,​4R,​5S)​-​3-​amino-​4-​hydroxy-​5-​methyl-​1-​piperidinyl]​-​3-​pyridinyl]​-​6-​(2,​6-​difluorophenyl)​-​5-​fluoro-​, hydrochloride (1:1)