You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[methyl-[1-(4-oxo-1-phenyl-5H-pyrazolo[3,4-d]pyrimidin-6-yl)azetidin-3-yl]amino]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
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C19H22N6O3
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