You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[[(2R)-3-acetyl-2-(2-methoxyphenyl)-2H-1,3,4-oxadiazol-5-yl]methyl]-1,3-dimethylpurine-2,6-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20N6O5
assistant