You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,4-dimethoxypyrimidin-5-yl)-3-[(2R)-1-methoxypropan-2-yl]-4,5-dihydropyrrolo[3,4-d]imidazol-6-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H19N5O4
assistant