3α-(Diphenylmethoxy) tropane (benztropine) and its analogues are tropane ring-containing dopamine uptake inhibitors that display binding and behavioral profiles that are distinct from cocaine. We previously prepared a benztropine-based photoaffinity label [125I]-(N-[4-(4'- azido-3'-iodophenyl) butyl]-3α-[bis (4'-fluorophenyl) methoxy] tropane,[125I] 1, that covalently attached to the 1-2 transmembrane spanning region of the dopamine ...