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 [2-[(3-fluorophenyl)methyl-methylamino]-2-oxoethyl] 2-(6-chloro-3-oxo-4H-1,4-benzothiazin-2-yl)acetate .
user
C20H18ClFN2O4S
assistant