In the paper by Laudon et al. published in J. Endocr. (1988)116, 43–53 the nomenclature of the melatonin antagonistshould be N-(2,4-dinitrophenyl)-5-methoxytryptamine insteadof N-(3,5-dinitrophenyl)-5-methoxytryptamine, and the startingmaterial should be fluoro-2,4-dinitrobenzene instead of fluoro-3,5-dinitrobenzene.