ALD-52
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| Other names | ALD52; ALD; 1-Acetyl-N,N-diethyllysergamide; 1-Acetyl-LSD; 1A-LSD; N-Acetyl-LSD; Acetyl-LSD | 
| Routes of administration | Oral | 
| Drug class | Serotonergic psychedelic; Hallucinogen | 
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| Chemical and physical data | |
| Formula | C22H27N3O2 | 
| Molar mass | 365.477 g·mol−1 | 
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ALD-52, also known as 1-acetyl-LSD (1A-LSD), is a psychedelic drug of the lysergamide family related to lysergic acid diethylamide (LSD). It has been reported to produce similar psychoactive effects as LSD, but its pharmacological effects on humans are poorly understood.
The drug is assumed to act as a prodrug to LSD in humans, and this has been substantiated in vitro.
ALD-52 was initially synthesized in 1957 by Albert Hofmann. The purported first confirmed detection of the substance on the illicit market occurred in April 2016.