| abstract |
4-benzylpiperidine derivatives of formula (l) and pharmaceutically acceptable salts thereofn n n n n n n n Wherein X is hydrogen or fluoro, R is hydrogen or p-fluorobenzoyl, α-hydroxy-p-fluorobenzyl, p-fluorophenoxy, bis (p-fluorophenyl) methyl and One group selected from 8-azaspiro [4,5] decane-7,9-diane-8-yl-mephile, provided that it is not hydrogen and p-fluorobenzoyl, respectively, upon X and R migration. |