2H-​Imidazo[4,​5-​c]​quinolin-​2-​one, 7-​(3,​5-​dimethyl-​4-​isoxazolyl)​-​1,​3-​dihydro-​8-​methoxy-​1-​[(1R)​-​1-​(2-​pyridinyl)​ethyl]​-​, hydrochloride (1:2)