Process for the preparation of the (-)-N-methyl-N- 4-(4-phenyl-4-acetyl-aminopiperidin-1-yl)-2-(3,4-dichlorophenyl)butyl -benzamide and its pharmaceutically acceptable salts
Process for the preparation of the (-)-N-methyl-N- 4-(4-phenyl-4-acetyl-aminopiperidin-1-yl)-2-(3,4-dichlorophenyl)butyl -benzamide and its pharmaceutically acceptable salts