You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,4R)-N-(2-aminoethyl)-4-(bromomethyl)-7,7-dimethyl-3-oxobicyclo[2.2.1]heptane-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H21BrN2O2
assistant