The 2C-T subfamily (2C-T-x) consists of psychedelic thiophenethylamines that share the 2C family's core 2,5-dimethoxyphenethylamine scaffold but with sulfur-containing alkylthio substituents at the 4-position, rather than the halogens or simple alkyl groups of the other 2C compounds. This structural difference — the presence of a sulfur atom in the 4-position side chain — produces a fundamentally different pharmacological and toxicological profile that distinguishes the 2C-T family from all other 2C compounds and from most other classical psychedelics.
The 2C-T family was developed by Alexander Shulgin and documented in PiHKAL (1991). The most extensively studied members are 2C-T-2 (4-ethylthio), 2C-T-7 (4-n-propylthio), and 2C-T-21 (4-fluoroethylthio). Lesser-known members include 2C-T-4, 2C-T-8, and others. Shulgin documented positive experiences with several family members, particularly 2C-T-7, and rated some of them highly among his extensive catalog.
The post-PiHKAL history of the 2C-T family is substantially defined by tragedy: multiple documented fatalities associated primarily with 2C-T-2 and 2C-T-7 in the early 2000s established these compounds as carrying a qualitatively different risk profile than the broader 2C series. The mechanism — involving interaction with monoamine oxidase enzymes and consequent serotonin toxicity — means that the 2C-T compounds cannot be treated as simply "stronger" or "weaker" versions of compounds like 2C-B. They represent a distinct and more hazardous pharmacological class.