You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by spiro[7-oxa-1-azoniatetracyclo[10.2.1.05,14.08,13]pentadeca-1,3,5(14),8,10,12-hexaene-15,6'-pyrido[2,1-a]isoindol-5-ium]-6-one ?
user
C24H14N2O2+2
assistant