You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 11'-(1-phenylbenzimidazol-2-yl)spiro[fluoreno[3,2-b][1]benzothiole-11,14'-tetracyclo[13.4.0.02,7.08,13]nonadeca-1(19),2,4,6,8(13),9,11,15,17-nonaene] 5,5-dioxide into its molecular formula.
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C50H30N2O2S
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