You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[2-[9-(diaminomethylideneamino)-6-oxo-12,13-dihydro-11H-benzo[c][1]benzoxonin-1-yl]-2-oxoethyl]butanedioic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H23N3O7
assistant