You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 9-(5-carbazol-9-ylspiro[3,13-diazatricyclo[7.4.0.02,7]trideca-1(9),2(7),3,5,10,12-hexaene-8,9'-thioxanthene]-2'-yl)carbazole-3,6-dicarbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C49H26N6S
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