You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-[[2-(dimethylamino)pyridin-3-yl]methyl]-3-ethyl-2-[(4-methylphenyl)methyl]guanidine is given. What is its corresponding molecular formula?
user
C19H27N5
assistant