6-AB
6-AB, also known as 6-amino-6,7,8,9-tetrahydro-5H-benzocycloheptene, is a conformationally restricted analogue of amphetamine related to 2-aminoindane and 2-aminotetralin. Unlike amphetamine, 2-AI, and 2-AT, 6-AB did not produce stimulant-type effects in animals. In another study, it produced a biphasic effect at high doses, with initial hypolocomotion followed after a few hours by weak locomotor stimulation. 7-AB is a positional isomer of 6-AB.