You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named tert-butyl N-[[1-[2-(2-methyl-3,4-dihydro-2H-1,5-benzothiazepin-5-yl)-2-oxoethyl]piperidin-4-yl]methyl]carbamate by IUPAC nomenclature, provide its molecular formula.
user
C23H35N3O3S
assistant