β-​Alanine, N-​[[2-​[[[4-​(aminoiminomethyl)​phenyl]​amino]​methyl]​-​1-​methyl-​1H-​benzimidazol-​5-​yl]​carbonyl]​-​N-​2-​pyridinyl-​, ethyl ester, hydrochloride (1:1)