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-(4-chlorophenyl)-3-(2,3-dihydro-1,4-benzodioxin-6-yl)-N-[(4R)-4-methyl-4,5-dihydro-1,3-thiazol-2-yl]prop-2-enamide .
user
C21H19ClN2O3S
assistant