10,11-Secoergoline, also known as 3-(2-piperidylmethyl)indole or as ñ,N-tetramethylenetryptamine, is the structure of ergoline in which the bond between the 10 and 11 positions of the ring system has been broken to unconstrain the molecule. It is also a tryptamine with the amine cyclized into a piperidine ring connected to the ñ position.
A notable derivative of 10,11-secoergoline is CT-5252 (methyl-12-bromo-8,9-didehydro-2,3ò-dihydro-6-methyl-10,11-secoergoline-8-carboxylate), which is an analogue of lysergic acid diethylamide (LSD) with some of the same behavioral effects in animals but with much lower potency.