You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 3-[2-[4-(6-aminopyridin-2-yl)phenyl]ethyl]-3-azabicyclo[3.1.0]hexane-6-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25N3O2
assistant