You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-methyl-2-[1-[N'-methyl-N-[3-(N-methylanilino)propyl]carbamimidoyl]piperidin-4-yl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C20H33N5O
assistant