You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[[4-(4-fluorophenyl)piperazin-1-yl]methyl]-[1,2,4]triazolo[3,4-b][1,3]benzothiazole-1-thione .
user
C19H18FN5S2
assistant