You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)ethyl 3,4,5-trichloropyridine-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H12Cl3N3O3S
assistant