You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
13-oxoniapentacyclo[12.8.0.03,12.04,9.017,22]docosa-1(14),2,4,6,8,10,12,15,17,19,21-undecaene;perchlorate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H13ClO5
assistant