You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N,N-diethyl-5-[1-[(3-ethyl-1H-1,2,4-triazol-5-yl)methyl]benzimidazol-2-yl]pyridin-2-amine using the IUPAC nomenclature.
user
C21H25N7
assistant