You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[2-[(8S)-2-(furan-3-ylmethyl)-5-oxa-2-azaspiro[3.4]octan-8-yl]ethyl]pyrrolidine-1-carboxamide .
user
C18H27N3O3
assistant