You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1S,6S,8S)-10,10-dimethyl-4-oxo-3-azabicyclo[4.3.1]decan-8-yl] (E)-3-phenylprop-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25NO3
assistant