You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[4-(3,4-difluorophenyl)piperidin-3-yl]-2-methyl-1,3-dioxoisoindole-5-carboxamide;hydrochloride .
user
C21H20ClF2N3O3
assistant