You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(2R)-3-acetyl-5-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)-2H-1,3,4-oxadiazol-2-yl]-4-methoxyphenyl] acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H20N6O5
assistant