2C-T-7

2C-T-7 (2,5-dimethoxy-4-(n)-propylthiophenethylamine), colloquially known as "Blue Mystic" or "7th Heaven" in online drug markets of the early 2000s, is a psychedelic thiophenethylamine of the 2C-T family first synthesized and documented by Alexander Shulgin in PiHKAL (1991). Along with 2C-T-2, 2C-T-7 carries a documented history of fatalities and severe adverse events that makes it one of the most explicitly hazardous compounds in the phenethylamine psychedelic family.

At active doses (10–30 mg), 2C-T-7 produces a 6–8 hour psychedelic experience with visual phenomena, sensory enhancement, and a variable headspace ranging from euphoric and empathogenic to anxious and dark. The n-propylthio substituent at C4 is closely related to the ethylthio group of 2C-T-2, and the two compounds share the fundamental toxicological concern of MAO interaction. Despite Shulgin's positive early documentation, the compound gained notoriety through a series of high-profile deaths in the United States in 2000–2001 that brought the 2C-T family and research chemicals broadly to mainstream attention.

The fatalities associated with 2C-T-7 share a pattern: high doses (well above Shulgin's documented active range), combination with other serotonergic or stimulant substances (MDMA, DXM, and other serotonin-active compounds appear in many cases), and features consistent with serotonin syndrome and cardiovascular collapse. The harm reduction community consensus is unambiguous: 2C-T-7's risk profile does not support its use given the availability of safer alternatives.