N-(3-Diethylamino-3-oxopropyl)-N-methyltryptamine (N-DEAOP-NMT), also known as desvinyl-LSD or 9,10-dinor-LSD, is a tryptamine derivative and a "partial" or simplified lysergamide which is closely related to the highly potent serotonergic psychedelic lysergic acid diethylamide (LSD). It is the analogue of LSD in which two of LSD's carbon atoms in the ergoline ring, those at positions 9 and 10, have been removed. This in turn renders the N-DEAOP-NMT molecule flexible and makes it a non-rigid tryptamine rather than an ergoline. The compound is pharmacologically active, as are a number of its analogues and derivatives, with activities of the compounds including serotonin 5-HT2A receptor agonism and LSD- or hallucinogen-like effects.