You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,7R)-7-tert-butyl-2-(2,4-dichlorophenyl)-2,3,5,6,7,8-hexahydro-1H-[1]benzothiolo[2,3-d]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22Cl2N2OS
assistant