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1-Propionyl-d-lysergic acid diethylamide (also known as 1P-LSD) is a semisynthetic compound of the lysergamide class. It is named for the propionyl group bound to the nitrogen of the polycyclic indole group of LSD. 1P-LSD is homologous to ALD-52, which holds an acetyl group bound to the nitrogen instead of the propionyl group bound at the same location. The structure of 1P-LSD contains a polycyclic group featuring a bicyclic hexahydro indole bound to a bicyclic quinoline group