You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance tert-butyl 4-[5-(5-methylsulfanyl-1-benzofuran-2-yl)-1,2,4-oxadiazol-3-yl]piperidine-1-carboxylate .
user
C21H25N3O4S
assistant