You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[4-oxo-4-[(5-oxo-4-oxatricyclo[4.2.1.03,7]nonan-2-yl)oxy]butoxy]ethyl 2,2-dimethylbutanoate into molecular formula.
user
C20H30O7
assistant