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-phenyl-4-(2-phenylpyrimidin-5-yl)-6-spiro[fluoreno[3,2-b][1]benzothiole-11,2'-tricyclo[9.4.0.03,8]pentadeca-1(15),3(8),4,6,9,11,13-heptaene]-5'-ylpyrimidine .
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C53H32N4S
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