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 [7-chloro-1-(3-propan-2-yl-4-propylphenyl)-2,3-dihydroindol-5-yl]oxymethylphosphinous acid is given. What is its corresponding molecular formula?
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C21H27ClNO2P
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