Lysergic acid 2,4-dimethylazetidide
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| Other names | Lysergic acid 2,4-dimethylazetidine; LSZ; LA-SS-Az; LA-Azetidide; LSD-Azetidide; Diazedine; Lambda | 
| Routes of administration | Oral | 
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| Formula | C21H25N3O | 
| Molar mass | 335.451 g·mol−1 | 
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Lysergic acid 2,4-dimethylazetidide, also known as LSZ, LA-SS-Az, or LA-Azetidide, is an analog of LSD developed by the team led by David E. Nichols at Purdue University. It was developed as a rigid analog of LSD with the diethylamide group constrained into an azetidine ring in order to map the binding site at the 5-HT2A receptor. There are three possible stereoisomers around the azetidine ring, with the (S,S)-(+) isomer being the most active, slightly more potent than LSD itself in drug discrimination tests using trained rats.
There have been several unconfirmed reports of lysergic acid 2,4-dimethylazetidide being synthesized in illicit laboratories and distributed on blotter paper or in liquid solution under names such as "diazedine" and "λ".