Memantine Desmethyl Impurity HCl

(1s,3s,5R,7S)-3-methyladamantan-1-amine hydrochloride|3-methyladamantan-1-amine hydrochloride|3-methyladamantan-1-amine hydrochloride;|3-Methyltricyclo[3.3.1.13,7]decan-1-amine hydrochloride ;