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 N-[5-[3-[4-(5-acetylthiophen-2-yl)-1H-benzimidazol-2-yl]-2H-pyrazolo[3,4-b]pyridin-5-yl]pyridin-3-yl]butanamide .
user
C28H23N7O2S
assistant