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What is the molecular formula of the molecule 3-[17-(3-isocyanophenyl)-8,14-bis(N-(4-trimethylsilylphenyl)anilino)spiro[4,18-dioxa-6,16-diazapentacyclo[10.7.0.02,10.03,7.015,19]nonadeca-1(19),2,5,7,9,12,14,16-octaene-11,9'-fluorene]-5-yl]benzonitrile ?
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C71H54N6O2Si2
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