monocarboxylic acid amide organic heterotetracyclic compound ergoline alkaloid lysergic acid diethylamide http://id.loc.gov/authorities/subjects/sh85079185 http://purl.bioontology.org/ontology/MESH/D008238 http://purl.bioontology.org/ontology/SNOMEDCT/15698006 http://purl.obolibrary.org/obo/CHEBI_6605 https://en.wikipedia.org/wiki/Category:Lysergic_acid_diethylamide https://en.wikipedia.org/wiki/Lysergic_acid_diethylamide https://www.wikidata.org/wiki/Q23118 BF209.L9 An ergoline alkaloid arising from formal condensation of lysergic acid with diethylamine. RM666.L88 RC483.5.L9 HV5822.5.L9 LSD Semisynthetic derivative of ergot (Claviceps purpurea). It has complex effects on serotonergic systems including antagonism at some peripheral serotonin receptors, both agonist and antagonist actions at central nervous system serotonin receptors, and possibly effects on serotonin turnover. It is a potent hallucinogen, but the mechanisms of that effect are not well understood. acid synthetic aphrodisiac The Encyclopedia of Unusual Sex Practices