You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(2,2-diphenylethyl)-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-6-yl]ethanamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19N5S
assistant