You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(4-methylpiperazin-1-yl)-6,7,8,9-tetrahydro-[1]benzofuro[3,2-d]pyrimidin-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H21N5O
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