You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
12-(2-chlorobenzoyl)-2,6,7,12-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H13ClN4O2
assistant