You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-methyl-7-(2-methyl-4,5-dihydro-1H-naphtho[2,1-e]benzimidazol-7-yl)-3,4-dihydrochromeno[3,4-d]imidazole ?
user
C27H22N4O
assistant