N-Methyl-2-(pyridin-2-yl)-N-[2-(pyridin-2-yl)ethyl]ethanamine Trihydrochloride; Betahistine Dihydrochloride Impurity C as Trihydrochloride; Betahistine Dihydrochloride EP Impurity C as Trihydrochloride; Betahistine EP Impurity C Trihydrochloride; N-Methyl-N,N-bis(2-pyridylethyl)amine Trihydrochloride; 2-Pyridineethanamine, N-methyl-N-[2-(2-pyridinyl)ethyl]-, hydrochloride (1:3)