1D-LSD
1D-LSD (1-(1,2-dimethylcyclobutane-1-carbonyl)-lysergic acid diethylamide) is a psychotropic substance and a research chemical that has potential psychedelic effects. It is believed to be a prodrug for LSD and has replaced 1V-LSD in Germany after 1V-LSD became covered by the German NpSG law in 2022. It is also available as tartrate. Legality

Germany 
Currently 1D-LSD is neither covered by the German BTMG nor the NpSG law and can thus be sold for research purposes. Austria 
According to the current legal situation, 1D-LSD is neither explicitly mentioned in the Narcotic Drugs Ordinance nor in the Psychotropic Substances Ordinance (SV/PV), thus it is neither to be classified as a narcotic drug in the sense of the SV nor as a psychotropic substance in the sense of the PV. See also 

 1V-LSD
 1cP-LSD
 1T-LSD

References 

Designer drugs
Psychedelic drugs
Lysergamides
Prodrugs
Cyclobutanes