Aleph (also known as DOT or 2,5-dimethoxy-4-methylthioamphetamine) is a psychedelic hallucinogenic drug and a substituted amphetamine of the phenethylamine class of compounds, which can be used as an entheogen.

In his book PiHKAL, Shulgin lists the dosage range as 5–10 mg, with effects typically lasting for 6 to 8 hours.

Dosage: 7–12 mg Duration: 8–16 hours Effects: Strong visuals 2C analog: 2C-T-2 CAS number: 185562-00-9

Dosage: 7–12 mg Duration: 12–20 hours Effects: "profound and deep learning experiences" - Alexander Shulgin 2C analog: 2C-T-4 CAS number: 123643-26-5

Dosage: 40 mg or more Duration: very long, unspecified Effects: enhances other psychoactive drugs, similar to 2C-D 2C analog: 2C-T-6 (has never been synthesized[citation needed]) CAS number: 952006-44-9