You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,7S)-7-tert-butyl-2-(1H-indol-3-yl)-2,3,5,6,7,8-hexahydro-1H-[1]benzothiolo[2,3-d]pyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H25N3OS
assistant