You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (4R)-4-(3-iodo-4-methoxyphenyl)-2-methyl-5-oxo-1,4-dihydroindeno[1,2-b]pyridine-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H18INO4
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