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 4-[[2-[[(1S)-7-fluoro-1-methyl-3-oxo-1,2-dihydroinden-4-yl]oxy]acetyl]amino]-N-methylbenzamide ?
user
C20H19FN2O4
assistant