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What is the molecular formula of the compound with this IUPAC name 9-(4-butyl-2,6-dimethylphenyl)-12,15-diethyl-10-oxa-21-azahexacyclo[9.8.2.02,7.08,21.012,15.016,20]henicosa-1(20),2,4,6,8,13,16,18-octaene ?
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C35H37NO
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