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 1-(2,4-difluorobenzoyl)-N-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-ylmethyl)piperidine-4-carboxamide ?
user
C21H25F2N5O2
assistant