You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-cyclobutyl-2,8-dimethyl-1,2,4,5-tetrahydro-[1,4]diazepino[1,7-a]benzimidazole;3-cyclobutyl-4,8-dimethyl-1,2,4,5-tetrahydro-[1,4]diazepino[1,7-a]benzimidazole;3-cyclobutyl-2-methyl-8-(4-methylphenyl)-1,2,4,5-tetrahydro-[1,4]diazepino[1,7-a]benzimidazole;3-cyclobutyl-4-methyl-8-(4-methylphenyl)-1,2,4,5-tetrahydro-[1,4]diazepino[1,7-a]benzimidazole;methane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C81H104N12
assistant