You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(2-hydroxy-5-methoxyphenyl)methyl]-2-methyl-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H19N3O3
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