You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,5R,7S)-N-benzyl-7-methyl-4-(3-methylbutanoyl)-1-oxa-4-azaspiro[4.5]decane-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H32N2O3
assistant