You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-phenyl-5-[4-(propan-2-ylideneamino)oxyphenyl]-[1,2,4]triazolo[1,5-a]pyridin-2-amine .
user
C21H19N5O
assistant