You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 5-[[2-[(2S)-2-[4-(difluoromethyl)phenyl]piperidin-1-yl]-2-oxoacetyl]amino]pyridine-3-carboxamide ?
user
C20H20F2N4O3
assistant