CT-5126, also known as 5-methoxy-6,8-dichloro-3-aminochroman, is a cyclized phenethylamine and 3-aminochroman derivative related to psychedelic phenethylamines like mescaline. In contrast to its non-cyclized analogue CT-5172 (2,6-dimethoxy-3,5-dichlorophenethylamine), the drug was found to have negligible hallucinogen-like effects in cats. CT-5126 was first described in the scientific literature by 1969. Various related analogues, such as CT-5172 and CT-4719, have also been described. CT-5126 and related compounds were developed at the Laboratoire de Chimie Thérapeutique (CT; Therapeutic Chemistry Laboratory) of the Pasteur Institute in Paris, France.