You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 8-(1,3-dihydro-2-benzofuran-4-carbonyl)-1-(2-methylpropyl)-1,3,8-triazaspiro[4.5]decane-2,4-dione .
user
C20H25N3O4
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