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 2,7-dimethyl-9-propan-2-ylcarbazole;2-isocyano-7-methyl-9-propan-2-ylcarbazole;2-isocyano-9-propan-2-ylcarbazole;2-methyl-9-propan-2-ylcarbazole;9-propan-2-ylcarbazole;5-propan-2-ylpyrido[3,2-b]indole;5-propan-2-ylpyrido[4,3-b]indole;9-propan-2-ylpyrido[2,3-b]indole .
user
C123H123N13
assistant