You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[3-[(1S)-1-(2-amino-5-chloropyridin-3-yl)oxyethyl]phenyl]-3-cyanobenzamide is given. What is its corresponding molecular formula?
user
C21H17ClN4O2
assistant