You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(2,6-difluorophenyl)-2-(dimethylamino)ethyl]-6-azaspiro[2.5]octane-2-carboxamide;dihydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27Cl2F2N3O
assistant