With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Jackson family are humans.
text_B: A carceplex is a class of chemical structures in the carcerand family that are hinged , and can be closed using reagents that react with the carceplex and trap precursors of reactive intermediates , and are unreactive with the trapped precursor or reactive intermediate .. carcerand. carcerand. This is useful for determining the spectroscopic and crystallographic properties of reactive intermediates in relative isolation , particularly compounds prone to dimerization like cyclobutadiene .. cyclobutadiene. cyclobutadiene
not_related.