You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[2-(propylamino)imidazo[2,1-b][1,3,4]thiadiazol-5-yl]phenyl]prop-2-enoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H16N4O2S
assistant