4-Morpholinepropanoic acid, 8-methyl-8-azabicyclo(3.2.1)oct-3-yl ester, dihydrochloride, exo- 87168-51-2 exo-8-Methyl-8-azabicyclo(3.2.1)oct-3-yl-4-morpholinepropanoate dihydrochloride