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 6'-(1,3-dihydroxy-4,5,6,7-tetrahydroisoindol-2-yl)-1'-prop-2-enylspiro[cyclopropane-1,3'-indole]-2'-one is given. What is its corresponding molecular formula?
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C21H22N2O3
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