You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2S)-1-[2-oxo-2-[(3S)-3-phenyl-2,3-dihydro-1,4-benzothiazin-4-yl]ethyl]piperidine-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26N2O3S
assistant