You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 4-[[(2-bromopyridin-4-yl)amino]methyl]piperidine-1-carboxylate;ethane;propane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H38BrN3O2
assistant