1-Pyrrolidinepropanoic acid, 8-methyl-8-azabicyclo(3.2.1)oct-3-yl ester, dihydrochloride, hydrate, exo- (2:4:1) 87168-44-3 exo-8-Methyl-8-azabicyclo(3.2.1)oct-3-yl-1-pyrrolidinepropanoate dihydrochloride hydrate