1-Pyrrolidinepropanoic acid, 8-methyl-8-azabicyclo(3.2.1)oct-3-yl ester, dihydrochloride, endo- 87168-45-4 endo-8-Methyl-8-azabicyclo(3.2.1)oct-3-yl-1-pyrrolidinepropanoate dihydrochloride