2C-I, also known as 2,5-dimethoxy-4-iodophenethylamine, is a phenethylamine of the 2C family with psychedelic effects. It was first synthesized by Alexander Shulgin, and is described in Shulgin's book PiHKAL (1991).
The substance is consumed as a recreational drug, and is circulated in the drug market in a powder form. 2C-I is sometimes confused with other related chemical substances such as 25I-NBOMe (2C-I-NBOMe), nicknamed "Smiles" and "N-bomb" in the media.