You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-chloro-5-[2-[4-(4-ethyl-2,3,4,5-tetrahydro-1-benzothiepin-5-yl)piperazin-1-yl]ethyl]-1,3-dihydroindol-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H32ClN3OS
assistant