You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4-methoxyphenyl)-4-methyl-9-propan-2-yl-8,10-dihydropyrano[2,3-f][1,3]benzoxazin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23NO4
assistant