You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-benzyl-8-[(3,5-dimethoxyphenyl)methyl]-4-hydroxy-1-(2-methoxyethyl)-4-(2-methylprop-1-enyl)-1,3,8-triazaspiro[4.5]decan-2-one by IUPAC nomenclature, provide its molecular formula.
user
C30H41N3O5
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