You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (10aR)-10a-[(E)-2-[3-methoxy-4-[(4-methylphenyl)methoxy]phenyl]ethenyl]-8,10,10-trimethyl-3,4-dihydro-1H-pyrimido[1,2-a]indol-2-one .
user
C31H34N2O3
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