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 (2R)-N-[2-(3-thiophen-2-ylpropanoyl)-3,4-dihydro-1H-isoquinolin-7-yl]oxolane-2-carboxamide ?
user
C21H24N2O3S
assistant