You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[[(6S,7R)-7-(4-chloro-3-fluorophenyl)-1,4-oxazepan-6-yl]methyl]-2-(3-chloropyridin-2-yl)oxyacetamide .
user
C19H20Cl2FN3O3
assistant