2C-T-13 or 2,5-dimethoxy-4-(β-methoxyethylthio)phenethylamine is a psychedelic phenethylamine of the 2C family. It was presumably first synthesized by Alexander Shulgin and reported in his book PiHKAL (Phenethylamines i Have Known And Loved).

2C-T-13 is the 2 carbon homologue of Aleph-13. The full chemical name is 2-[4-(2-methoxyethylthio)-2,5-dimethoxyphenyl]ethanamine. The drug has structural properties similar to mescaline and other drugs in the 2C-T series, with the most closely related compounds being 2C-T-7 and 2C-T-21.

The dosage range of 2C-T-13 is typically 25 - 40 mg and its duration is approximately 6–8 hours according to Shulgin. 2C-T-13 produces many closed-eye visuals and geometric patterns. It also produces slight visual distortion.

The mechanism that produces 2C-T-13's hallucinogenic and entheogenic effects has not been specifically established, however it is most likely to result from action as a 5-HT_2A serotonin receptor agonist in the brain, a mechanism of action shared by all of the hallucinogenic tryptamines and phenethylamines for which the mechanism of action is known.