It has been brought to the authors' attention that Fig. 1 of "In vitro structure-activity relationship determination of 30 psychedelic new psychoactive substances by means of β-arrestin 2 recruitment to the serotonin 2A receptor" contained a mistake in the structures for 2C-B-FLY and Bromo-DragonFLY. This has now been corrected. The authors apologize for any inconvenience caused.