You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6,13-dioxatetracyclo[6.6.2.04,16.011,15]hexadeca-1(15),2,4(16),8,10-pentaene-5,7,12,14-tetrone;2-methylpropan-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H15NO6
assistant