4-Methylaminocyclohexanone (2,2-dimethyltrimethylene) ketal Hydrochloride; 1,5-Dioxaspiro[5.5]undecan-9-amine, N,3,3-trimethyl-, Hydrochloride; N,3,3-trimethyl-1,5-dioxaspiro[5.5]undecan-9-amine Hydrochloride