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 tert-butyl N-[(3S)-1-[(5-chlorothiophen-2-yl)methyl]-2-oxo-3,4-dihydroquinolin-3-yl]carbamate ?
user
C19H21ClN2O3S
assistant