You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(1H-benzimidazol-2-yl)-N-ethyl-N-[[5-(2-methylpropyl)-1,2,4-oxadiazol-3-yl]methyl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H25N5O2
assistant