You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (11E)-3-phenacyl-9,14-dioxatricyclo[13.3.1.14,8]icosa-4(20),5,7,11,15(19),16-hexaen-2-one using the IUPAC nomenclature.
user
C26H24O4
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