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-[4-(2-chlorophenoxy)phenyl]-3-(5-sulfanylidene-3-thiophen-2-yl-1H-1,2,4-triazol-4-yl)propanamide .
user
C21H17ClN4O2S2
assistant