<jats:p><jats:bold>Kopsirachine, an Unusual Alkaloid from the Apocynaceae <jats:italic>Kopsia dasyrachis</jats:italic> Ridl.</jats:bold><jats:p>From the leaves of <jats:italic>Kopsia dasyrachis</jats:italic> Ridl. a new type of alkaloid, kopsirachine (<jats:bold>1</jats:bold>), built up from catechin (<jats:bold>2</jats:bold>) and skytanthine (<jats:bold>3</jats:bold>) has been isolated. The structure elucidationis based on spectral and chemical evidence. Oxidative cleavage of its derivative <jats:bold>4</jats:bold> with KMnO<jats:sub>4</jats:sub> afforded veratric acid wich was identified as its methylester by comparison with an authentic sample. Pyrolysis of <jats:bold>1</jats:bold> yielded δ‐skytanthine (<jats:bold>3</jats:bold>). The stereochemistry of the skytanthine substituents in <jats:bold>1</jats:bold> could not yet be established.