You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2S)-butan-2-yl]-4-[(E)-[4-[(4-methylphenyl)methyl]-3-oxo-1,4-benzoxazin-2-ylidene]methyl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H28N2O3
assistant