5-MAPBT (5-Methylaminopropylbenzothiophene) is an
empathogenic drug closely related to
5-MAPB but with the oxygen atom replaced by sulfur, changing the core ring structure to
benzothiophene rather than
benzofuran.[1]
^WO 2022/010937, Baggott M, "Advantageous benzothiophene compositions for mental disorders or enhancement.", published 13 January 2022, assigned to Tactogen Inc.