ALD-52, or D-1-Acetyl lysergic acid diethylamide, is a semi-synthethic molecule of the lysergamide famiy. ALD-52 is a substituted derivative of lysergic acid. ALD-52's structure contains four rings, a bicyclic hexahydroindole fused to a bicyclic quinoline group. This core struture of ALD-52 is an indole derivative, and has tryptamine and phenethylamine groups embedded within it. ALD-52 contains a N,N-diethylcarboxamide functional group bound to R8 of the chemical structure. It is additionally substituted at carbon 6 with a methyl group.
ALD-52 is homologous to 1P-LSD, which contains an propionyl group bound to CH3CO- instead of the acetyl group bound to the same location.