You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (4S,7S)-2-amino-1-(dimethylamino)-4-(4-ethylphenyl)-5-oxo-7-phenyl-4,6,7,8-tetrahydroquinoline-3-carbonitrile .
user
C26H28N4O
assistant