You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(2-ethoxyphenoxy)methyl]-3-phenyl-[1,3,4]thiadiazolo[2,3-c][1,2,4]triazin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H16N4O3S
assistant