You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (2S)-N-(5-chloro-2-methoxyphenyl)-6-methyl-4-methylsulfonyl-2,3-dihydro-1,4-benzoxazine-2-carboxamide ?
user
C18H19ClN2O5S
assistant