2-Oxo-3-hydroxy-LSD, or 2-oxy-3-hydroxy-LSD, also known as O-H-LSD or OH-LSD, as well as more fully as 2-oxo-3-hydroxy-2,3-dihydro-LSD, is a lysergamide and the major metabolite of the psychedelic drug lysergic acid diethylamide (LSD).
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