You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-methyl-5-oxo-[1,2,4]triazolo[4,3-a]quinazolin-1-yl)methyl 4-(furan-2-carbonylamino)butanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H19N5O5
assistant