You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(9,9-dimethyl-5-oxo-4-oxatricyclo[4.2.1.03,7]nonan-2-yl)oxy]-2-oxoethyl] 2,3,3-trimethylbutanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H28O6
assistant