You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[N'-benzyl-N-[(2,5-difluorophenyl)methyl]carbamimidoyl]amino]-N,N-dimethylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H22F2N4O
assistant