You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-butyl-7-ethylfuro[3,2-e]benzimidazol-2-amine;1,7-diethyl-2-methyl-7,8-dihydrofuro[3,2-e]benzimidazole;1,7-diethyl-2-methylfuro[3,2-e]benzimidazole;7-ethyl-1,2-dimethyl-7,8-dihydrofuro[3,2-e]benzimidazole;7-ethyl-1,2-dimethylfuro[3,2-e]benzimidazole;1-(7-ethyl-2-methylfuro[2,3-g]benzimidazol-1-yl)-N,N-dimethylmethanamine;7-ethyl-1-propylfuro[3,2-e]benzimidazol-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C98H119N17O7
assistant