You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (8R)-8-(4-hydroxy-3,5-dimethoxyphenyl)-6-methyl-8H-[1,3]dioxolo[4,5-g]chromene-7-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22O8
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