You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[4-[4-(5-methyl-4-phenyl-1H-imidazol-2-yl)piperidin-1-yl]-7H-cyclopenta[b]pyridin-6-yl]phenyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H31N5O
assistant