You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-tert-butyl-1,8-diazatricyclo[7.4.0.03,7]trideca-3(7),8,10,12-tetraen-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H18N2O
assistant