You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
11-oxa-4,7,15-triaza-1-azoniapentacyclo[10.7.0.02,10.04,9.013,18]nonadeca-1(12),2,5,7,9,13(18),14,16-octaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H9N4O+
assistant