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 N-[5-(2-methyl-3-phenylprop-2-enylidene)-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]-2-phenylacetamide .
user
C21H18N2O2S2
assistant