You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1-(3-isothiocyanatophenyl)-3-[4-[(3-isothiocyanatophenyl)carbamothioylamino]butyl]thiourea using the IUPAC nomenclature.
user
C20H20N6S4
assistant