You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[2-[2-(3,4-dichlorophenyl)-2-oxoethyl]sulfanyl-4-oxothieno[3,2-d]pyrimidin-3-yl]-N-(2-phenylethyl)hexanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H27Cl2N3O3S2
assistant