You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-ethyl-5-[3-(4-methylpiperazin-1-yl)phenoxy]-1,2,4-triazol-3-yl]propan-1-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H28N6O
assistant