You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name ethyl (1R,2R,4'E,6S)-4'-(2-methoxy-2-oxoethylidene)-1',1',6-trimethyl-2',5-dioxospiro[9-oxabicyclo[4.2.1]non-7-ene-4,3'-cyclohexane]-2-carboxylate into its molecular formula.
user
C22H28O7
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