You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (4aR,6aR,12aS,12bR)-11-chloro-10-hydroxy-4,4,6a,12b-tetramethyl-2,3,4a,5,6,12a-hexahydro-1H-benzo[a]xanthen-9-one is given. What is its corresponding molecular formula?
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C21H27ClO3
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