You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 9-[6-[5-[3-(3,4-dihydrocarbazol-9-yl)phenyl]pyridin-3-yl]cyclohepta-1,3,6-trien-1-yl]carbazole into its molecular formula.
user
C42H31N3
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