You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-oxo-3-[1-(1,2,3,4-tetrahydroisoquinolin-8-yl)ethyl]-N-(1,3-thiazol-2-yl)-1,3-benzoxazole-6-sulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C21H20N4O4S2
assistant