You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[6-[(6,7-dimethoxyquinazolin-4-yl)amino]-1,3-benzothiazol-2-yl]pyridine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H18N6O3S
assistant