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system
Please write the molecular formula of the molecule 7-(4-carbazol-9-ylphenyl)-[1]benzofuro[2,3-b]carbazole;7-dibenzofuran-2-yl-[1]benzofuro[2,3-b]carbazole;7-dibenzothiophen-3-yl-[1]benzofuro[2,3-b]carbazole;7-(4-dibenzothiophen-2-ylphenyl)-[1]benzofuro[2,3-b]carbazole;7-(9,9-dimethylfluoren-2-yl)-[1]benzofuro[2,3-b]carbazole;7-[4-(9,9-dimethylfluoren-3-yl)phenyl]-[1]benzofuro[2,3-b]carbazole;7-naphthalen-1-yl-[1]benzofuro[2,3-b]carbazole;7-(9-phenylcarbazol-3-yl)-[1]benzofuro[2,3-b]carbazole .
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C268H166N10O9S2
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