You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-N-(3-methoxypropyl)-3-N-[4-(4-methylpiperazin-1-yl)phenyl]-1,2,4-triazine-3,5-diamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H27N7O
assistant