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 4-(5,6-dimethyl-1H-benzimidazol-2-yl)-N-(4-fluorophenyl)piperidine-1-carbothioamide using the IUPAC nomenclature.
user
C21H23FN4S
assistant