You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-[[5-cyclopropyl-2-[[(3E)-hexa-1,3-dien-3-yl]amino]pyrimidin-4-yl]amino]propyl]piperidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H31N5O
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