You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(6R)-2-amino-6-methyl-5,6,7,8-tetrahydroquinazolin-4-yl]methyl]piperidine-2,6-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H20N4O2
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