You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3S)-N-(4-bromo-3-methylphenyl)-N-formyl-1,3-dimethyl-7-oxabicyclo[2.2.1]heptane-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H20BrNO3
assistant