Process for preparing (1R,2S,4R)-(-)-2-[(2'-{N,N-dimethylamino}-ethoxy)]-2-[phenyl]-1,7,7-tri-[methyl]-bicyclo[2.2.1]heptane and pharmaceutically acceptable acid addition salts thereof
A process for preparing (1R,2S,4R)-(-)-2-[(2'-[N,N-dimethylamino}-ethoxy)]-2-[phenyl]-1,7,7-tri-[methyl]-bicyclo [2.2.1]heptane and pharmaceutically acceptable acid addition salts thereof with higher yields and higher grades of purity.