You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(ethoxymethyl)-4-(pyridin-3-ylmethylideneamino)-2,5-dihydro-1,2,4-triazin-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C12H15N5O2
assistant