You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-3-[2-(2-methyl-3,4-dihydro-2H-1,5-benzothiazepin-5-yl)-2-oxoethyl]-5-naphthalen-1-ylimidazolidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H25N3O3S
assistant