You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-methyl-10-[(1R)-1,2,3,4-tetrahydronaphthalen-1-yl]-10,11-dihydro-9H-isochromeno[4,3-g][1,3]benzoxazin-10-ium-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H24NO3+
assistant