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Thiomescaline (TM) is a pair of lesser-knownpsychedelic drugs with the molecular formula C11H17NO2S. 3-TM and 4-TM areanalogs ofmescaline in which an oxygen atom has been replaced with a sulfur atom. They were first synthesized byAlexander Shulgin and described in his bookPiHKAL.[1][2] Very little data exists on the pharmacological properties, metabolism, and toxicity of thiomescaline.[citation needed]

Dose: 60–100 mg
Duration: 8–12 hours
Effects: strong open and closed-eye visuals,synesthesia upon listening to music, +++ on theShulgin Rating Scale

Dose: 20–40 mg
Duration: 10–15 hours
Effects:LSD-like imagery and effects
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