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-[4-(4-fluoro-1H-benzimidazol-2-yl)butyl]-N-[(3-fluoropyridin-2-yl)methyl]-1,3-oxazole-4-carboxamide ?
user
C21H19F2N5O2
assistant