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The Alkaloids: Volume 1, Bisindole alkaloids. J. E. Saxton, A. A. Gorman, M. Hesse, H. Schmid, P. G. Waser, W. H. Hopff
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Heterocyclic Chemistry: Volume 4, Five-membered ring systems. H. Suschitzky, O. Meth-Cohn, G. V. Boyd, S. Gronowitz, O. Guilloton, H. Quiniou
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