You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N,N-dimethyl-1-[[[N'-methyl-N-[(4-nitrophenyl)methyl]carbamimidoyl]amino]methyl]cyclopentane-1-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C18H27N5O3
assistant