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Tietze, L. F., Brumby, T. and Pfeiffer, T. (1988), Intra- and intermolecular hetero Diels-Alder Reactions. XIX. Stereoselective synthesis of five- and seven-membered annulated ring systems by intramolecular hetero Diels-Alder Reaction. Liebigs Annalen der Chemie, 1988, p. 9–12.
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dx.doi.org/10.1002/jlac.198819880103
