You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-cyclopentyl-3-[1-[2-[di(propan-2-yl)amino]ethyl]pyrazolo[3,4-d]pyrimidin-4-yl]urea into its molecular formula.
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C19H31N7O
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