You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-ethyl-7,13-diphenyl-12-oxa-6-aza-5-azoniatetracyclo[6.5.2.04,15.011,14]pentadeca-1(13),2,4,6,9,14-hexaene;perchlorate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H21ClN2O5
assistant