You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2E)-N-benzyl-N-ethyl-2-[(3-pyridin-2-yl-1H-1,2,4-triazol-5-yl)methylidene]but-3-enamide;methanamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H26N6O
assistant