You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N,N-dimethyl-2-[[8-oxa-2-azaspiro[4.5]decan-2-yl-(oxolan-3-ylmethylamino)methylidene]amino]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H32N4O3
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