You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2S)-N-(cyclohexylmethyl)-7-methyl-4-methylsulfonyl-2,3-dihydro-1,4-benzoxazine-2-carboxamide into its molecular formula.
user
C18H26N2O4S
assistant