You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,3-dimethyl-8-[[(3S)-oxolan-3-yl]methyl]-1,3,8-triazaspiro[4.5]decane-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H23N3O3
assistant