You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(3-hydroxyphenyl)-2-methylidene-3-(morpholine-4-carbonyl)-1,3,4,6,7,8-hexahydroquinolin-5-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24N2O4
assistant