You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by methyl 2-[3-[(1E)-1-(2-oxo-1H-indol-3-ylidene)-3H-2-benzofuran-5-yl]propylamino]acetate ?
user
C22H22N2O4
assistant