The structure of the alkaloid (+)-tuberine, isolated from Haplophyllum tuberculatum, has been revised to N-benzoyl-4′-[(2″S,3″R,6″R)-(+)-7″-acetoxy-2″-hydroxy-3″,7″-dimethyl-3″,6″-epoxyoctyloxy]-phenethylamine on the basis of an X-ray crystallographic study. © 1990.