With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tunisia was taken over for eight hundred years.
text_B: Schwartz 's reagent is the common name for the chemical compound with the formula -LRB- C5H5 -RRB- 2ZrHCl , sometimes called zirconocene hydrochloride or zirconocene chloride hydride , and is named after Jeffrey Schwartz , a chemistry professor at Princeton University .. chemical compound. chemical compound. formula. chemical formula. Princeton University. Princeton University. This metallocene is used in organic synthesis for various transformations of alkenes and alkynes .. metallocene. metallocene. organic synthesis. organic synthesis. alkenes. alkenes. alkynes. alkynes
not_related.