You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[nitroso-(3,5,5,8,8-pentamethylnaphthalen-2-yl)methyl]phenyl]cyclohexane-1,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H31NO3
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