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I. Muhammad, I. A. Khan, N. H. Fischer and F. R. Fronczek.
Two stereoisomeric pentacyclic oxindole alkaloids from Uncaria tomentosa: uncarine C and uncarine E
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Acta Cryst. (2001). C57, 480-482Â Â Â Â
[DOI: 10.1107/S0108270101000932]