With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Clint Eastwood was in spaghetti Westerns.
text_B: -3 β - -LRB- 4-iodophenyl -RRB- tropane-2β-pyrrolidine carboxamide -LRB- RTI-4229-229 -RRB- is a potent and long-lasting stimulant drug which was developed in the 1990s as part of a large group of related analogues from the phenyltropane family .. stimulant. stimulant. phenyltropane. phenyltropane. tropane. tropane. pyrrolidine. pyrrolidine. carboxamide. carboxamide. With the combination of two potent dopamine transporter -LRB- DAT -RRB- binding motifs attached to the tropane ring , the p-iodophenyl group at the 3β-position and a pyrrolidine carboxamide at 2β , RTI-229 has extremely high selectivity for the dopamine transporter -LRB- 2600x and 4600x selective over NET and 5-HTT respectively -RRB- and is one of the most DAT-selective compounds in the RTI series .. dopamine transporter. dopamine transporter. tropane. tropane. pyrrolidine. pyrrolidine. carboxamide. carboxamide. NET. noradrenaline transporter. 5-HTT. serotonin transporter
not_related.