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 2-[7-[4-[1-(5-ethoxy-2-fluorophenyl)piperidin-4-yl]oxyphenyl]-1,4-dioxa-7-azaspiro[4.4]nonan-8-yl]acetonitrile .
user
C27H32FN3O4
assistant