You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(6-chloropyridin-3-yl)-1-[4-[4-[(1-ethylcyclopropyl)-methylamino]phenyl]phenyl]propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H27ClN2O
assistant