You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-methyl-3-[(2E)-2-[[3-(2-methylpropoxy)phenyl]methylidene]hydrazinyl]-4H-1,2,4-triazin-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H19N5O2
assistant