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 1-[(4R)-5,5-dimethyl-3-[(Z)-(4-methylphenyl)methylideneamino]-2-sulfanylidene-1,3-thiazolidin-4-yl]-1-hydroxy-3-(4-nitrophenyl)urea .
user
C20H21N5O4S2
assistant