You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (4R)-6-[2-(azepan-1-yl)-2-oxoethyl]sulfanyl-4-(3-chloro-4-methoxyphenyl)-2-oxo-3,4-dihydro-1H-pyridine-5-carbonitrile ?
user
C21H24ClN3O3S
assistant