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 [1-(3,4-dihydro-1H-isoquinolin-2-yl)-1-oxopropan-2-yl] 4-(5-chlorothiophen-2-yl)-4-oxobutanoate ?
user
C20H20ClNO4S
assistant