Cycloaddition reactions generate chemical complexity in a single step. Here we report the crystal structures of three homologous plant-derived cyclases involved in the biosynthesis of iboga and ...

Where it comes from: Aspidosperma quebracho-blanco extract (commonly called quebracho) comes from the bark of an evergreen tree that grows in the northern regions of Argentina. “The primary active ...

A PRELIMINARY pharmacological investigation of the total alkaloids of Aspidosperma oblongum A.DC. obtained by classical methods has been carried out. A 6 per cent solution of the hydrochlorides in an ...

This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...