You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(2-oxopropoxy)-4,8-di(piperidin-1-yl)pyrimido[5,4-d]pyrimidin-6-yl]oxypropan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H30N6O4
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