You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3S)-N-(2-ethylphenyl)-N,3-dimethyl-4-oxo-3,5-dihydro-2H-1,5-benzothiazepine-7-sulfonamide .
user
C19H22N2O3S2
assistant