You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3E)-3-[(E)-(2,5-dimethoxyphenyl)methylidenehydrazinylidene]-6-methylidene-1,2,4-triazin-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H13N5O3
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