You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(4-amino-2-methylquinolin-5-yl)oxy-2-methylpropan-2-yl]-3,5-dihydroxybenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H23N3O4
assistant