You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1S,9S)-4,5,12,13-tetramethoxy-17-[(1S)-1-phenylethyl]-17-azatetracyclo[7.7.1.02,7.010,15]heptadeca-2,4,6,10,12,14-hexaene into molecular formula.
user
C28H31NO4
assistant