You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7,7-dimethyl-5-(3-pyren-1-ylphenyl)indeno[2,1-b]carbazole;7-(3-pyren-1-ylphenyl)-[1]benzofuro[2,3-b]carbazole;7-(3-pyren-1-ylphenyl)-[1]benzothiolo[2,3-b]carbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C123H75N3OS
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