Task: Translation
Input (Czech): Zp sob p° pravy (-)-N-methyl-N-[4-(4-fenyl-4-acetylaminopiperidin-1-yl)-2-(3,4-dichlorfenyl)butyl]benzamidu a jeho farmaceuticky p°ijateln²ch sol , p°i kter m se pou  v  (+)-2-(3,4-dichlorfenyl)-4-hydroxybutylaminu vzorce I jako meziproduktu. Slou enina vzorce I p°edstavuje kl  ov² meziprodukt pro postup p° pravy tachykininov²ch antagonist .\
Output (English): Disclosed is a process for preparing (-)-N-methyl-N-[4-(4-phenyl-4-acetylaminopiperidin-1-yl)-2-(3,4-dichlorophenyl)butyl]benzamide and its pharmaceutically acceptable salts in which as an intermediate (+)-2-(3,4-dichlorophenyl)-4-hydroxybutylamine of the general formula I is used. The compound of the general formula I represents a key intermediate for preparation process of tachykinin antagonists.