You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3,4-dichlorobenzoyl)-N-[(2R)-2-(ethylamino)propyl]piperidine-3-carboxamide;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H26Cl3N3O2
assistant