You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[4'-[2-[3-(2,5-dimethylpyridin-3-yl)phenyl]phenyl]spiro[fluorene-9,9'-thioxanthene]-2-yl]-4,6-dimethyl-1,3,5-triazine .
user
C49H36N4S
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