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 6-(diethylamino)-5-[(Z)-[3-(furan-2-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-1,4-dimethyl-2-oxopyridine-3-carbonitrile .
user
C21H22N4O3S2
assistant