You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-[7-(1H-pyrrolo[2,3-b]pyridin-3-ylmethyl)-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-2-yl]aniline .
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C21H20N6
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