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6. Dehydrogenation with benzeneseleninic anhydride in the total synthesis of ergot alkaloids Ichiya Ninomiya,Chiyomi Hashimoto,Toshiko Kiguchi,Takeaki Naito,Derek H. R. Barton,Xavier Lusinchi,Pierre Milliet J. Chem. Soc. Perkin Trans. 1 1990 707