You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[(5-oxo-4-prop-2-enyl-[1,2,4]triazolo[4,3-a]quinazolin-1-yl)sulfanylmethyl]phenyl]benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H19N5OS
assistant