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 1-[4-[[3-(1H-benzimidazol-2-ylmethyl)imidazo[4,5-b]pyridin-2-yl]methyl]piperazin-1-yl]-2-phenylethanone .
user
C27H27N7O
assistant