You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 9-(furan-3-ylmethyl)-3-methyl-13-pyrimidin-2-yl-3,9,13-triazadispiro[4.0.56.35]tetradecan-4-one ?
user
C21H27N5O2
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