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Straightforward Access to Hexahydropyrrolo[2,3-b]indole Core by a Regioselective C3-Azo Coupling Reaction of Arenediazonium Compounds with Tryptamines. Stephens, D. E.; Larionov, O. V. Eur. J. Org. Chem. 2014, 3662–3670. 10.1002/ejoc.201402088