You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(6-bromo-2,3-dihydro-1,4-benzodioxin-7-yl)-N-(2,2-dimethylpropyl)-N-(2,2,2-trifluoroethyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H21BrF3NO3
assistant