5-APB (abbreviation of "5-(2-aminopropyl)benzofuran"; see infobox for the correct IUPAC name) is an empathogenic psychoactive compound of the substituted benzofuran, substituted amphetamine and substituted phenethylamine classes. 5-APB and other compounds are sometimes informally called "Benzofury". 5-APB is commonly found as the succinate and hydrochloride salt. The hydrochloride salt is 10% more potent by mass and doses should be adjusted accordingly. 5-APB has been sold as a designer drug since 2010.