You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (1S,4R,8S)-8-[(1R)-2,2-dimethyl-1-phenylpropoxy]-6-methyl-3-oxo-2-oxabicyclo[2.2.2]oct-5-ene-4-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26O5
assistant