You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (8S)-4-bromo-1-methoxy-N-naphthalen-1-ylsulfonyl-5,6,7,8-tetrahydroisoquinoline-8-carboxamide .
user
C21H19BrN2O4S
assistant