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 ethane;2-ethyl-3H-indole;2-ethyl-6-methyl-3,5-dihydropyrrolo[3,2-f]indole;2-ethyl-6-methyl-3,7-dihydropyrrolo[2,3-f]indole;2-methyl-3H-indole;propane .
user
C69H82N8
assistant