You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6,13,21,22,23,24-hexaoxaheptacyclo[17.2.1.15,8.112,15.02,17.03,9.010,16]tetracosa-2,17-diene-4,11-dione by IUPAC nomenclature, provide its molecular formula.
user
C18H16O8
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