You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 9-hydroxy-6-[2-(2-naphthalen-1-ylethoxy)ethyl]-1,4-dioxa-6-azaspiro[4.4]nonane-2,3-dione is given. What is its corresponding molecular formula?
user
C20H21NO6
assistant