You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (E)-N-[6-(2,4-dimethylphenyl)-[1,3]thiazolo[3,2-b][1,2,4]triazol-2-yl]-3-(4-nitrophenyl)prop-2-enamide .
user
C21H17N5O3S
assistant