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 identified by N-[4-[chloro(difluoro)methoxy]phenyl]-7-imidazol-1-yl-1-propan-2-ylbenzimidazole-5-carboxamide ?
user
C21H18ClF2N5O2
assistant