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 N-[5-[(4-bromo-3-chlorophenyl)methyl]-1,3-thiazol-2-yl]-3-methyl-1-oxo-4H-isochromene-3-carboxamide .
user
C21H16BrClN2O3S
assistant