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What is the molecular formula of the compound with this IUPAC name 12'-methoxy-7,7,10',10'-tetramethylspiro[1H-pyrano[2,3-g]indole-3,11'-3,13-diazatetracyclo[5.5.2.01,9.03,7]tetradecane]-2,2',14'-trione ?
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C27H31N3O5
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