You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,4S)-N-[(2R)-butan-2-yl]-2-methyl-1-[2-(4-nitrophenyl)acetyl]-3,4-dihydro-2H-quinoline-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H27N3O4
assistant