You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[1-(1H-benzimidazol-2-yl)-2-methylpropyl]-5-(furan-2-yl)pyrazolidine-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C19H23N5O2
assistant