You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name [(3S)-3-(methoxymethyl)-2-propan-2-yl-2,8-diazaspiro[4.5]decan-8-yl]-thiophen-3-ylmethanone ?
user
C18H28N2O2S
assistant