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What is the molecular formula of the compound with this IUPAC name 10,10-dimethyl-17-naphthalen-1-yl-14-phenyl-21-(3,4,5-trimethylcyclohexa-1,5-dien-1-yl)-10-silapentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1,3(11),4,6,8,12,14,16,18,20-decaene ?
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C47H40Si
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