1-Piperazinepropanoic acid, 8-methyl-8-azabicyclo(3.2.1)oct-3-yl ester, hydrochloride, hydrate, exo- (2:6:1) 87168-49-8 exo-8-Methyl-8-azabicyclo(3.2.1)oct-3-yl-1-piperazinepropanoate trihydrochloride hydrate