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Chemistry World September 18, 2014 Tim Wogan	Painkiller found in plants may not be natural after all In 2013 the surprising discovery was made that the opioid painkiller tramadol, thought to be synthetic, was being produced by the African herb Nauclea latifolia. However, new research casts doubt on this claim.
Chemistry World August 26, 2015 Andrea McGhee	How could a tree make tramadol? Researchers in France, Switzerland and Cameroon are convinced that the African pin-cushion tree produces the well-known painkiller Tramadol and are determined to prove it.
Chemistry World September 17, 2013 Ian Randall	Synthetic drug found in nature The bark of Nauclea latifolia contains tramadol at medicinal concentrations.