Bradford, TanyaWillis, AnthonyWhite, JonathanHerlt, AnthonyTaylor, Walter CMander, Lewis2015-12-100040-4039http://hdl.handle.net/1885/58034The structures of four new alkaloids isolated from the bark of the rain forest trees Galbulimima belgraveana and Galbulimima baccata have been determined by a combination of NMR spectra and single crystal X-ray crystallography. Two of the alkaloids are simple oxygenated derivatives of himbacine, while the remaining two are based on a novel 7,19-cyclo-himbacine skeleton.Keywords: 15alpha hydroxyhimbacine; alkaloid; unclassified drug; article; crystal structure; cycloaddition; drug structure; drug synthesis; Galbulimima baccata; Galbulimima belgraveana; nuclear magnetic resonance; oxygenation; stereochemistry; tree; X ray crystallo Alkaloids; Biosynthesis; Galbulimima belgraveana; Novel structures201110.1016/j.tetlet.2010.10.0112016-02-24