You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[3-[2-(1,3-benzothiazol-2-yl)carbazol-9-yl]phenyl]pyridin-4-yl]-1,3-oxazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C33H20N4OS
assistant