You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by N-[5-(3,4-dimethoxyphenyl)-1,3,4-thiadiazol-2-yl]-4-methoxy-1,3-benzothiazol-2-amine ?
user
C18H16N4O3S2
assistant