You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[(4-methoxyphenyl)sulfonylamino]-N-(3-oxo-4H-1,4-benzoxazin-6-yl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19N3O6S
assistant