You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S)-5-methyl-3-[2-[(2R)-2-methyl-3,4-dihydro-2H-1,5-benzothiazepin-5-yl]-2-oxoethyl]-5-phenylimidazolidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23N3O3S
assistant