You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(3E)-hexa-1,3,5-trien-3-yl]-6-(methoxymethyl)-5-methyl-3,4-dihydro-1H-pyrimidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H18N2O2
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