3′,4′,5′,6′ Tetradehydrolongicaudatine Y, an anhydronium base from Strychnos usambarensis

3′,4′,5′,6′ Tetradehydrolongicaudatine Y, an anhydronium base from Strychnos usambarensis 10-Hydroxy-Nb-methyl-corynantheol, a new quaternary alkaloid from the stem bark of Strychnos usambarensis Further alkaloids from strychnos longicaudata and strychnos ngouniensis Occurrence of longicaudatine, a new type of bis(indole) base and dinor-C-alkaloid H in Strychnos species Occurrence of longicaudatine, a new type of bis(indole) base and dinor-C-alkaloid H in Strychnos species CONTRIBUTION A L'ETUDE DES ALCALOIDES DU<i>STRYCHNOS USAMBARENSIS</i>¹ 10‘-Hydroxyusambarensine, a New Antimalarial Bisindole Alkaloid from the Roots of <i>Strychnos </i><i>u</i><i>sambarensis</i> 10‘-Hydroxyusambarensine, a New Antimalarial Bisindole Alkaloid from the Roots of <i>Strychnos </i><i>u</i><i>sambarensis</i> La strychnoxanthine, un alcaloïde monoterpénique d'un nouveau type isolé à partir du Strychnos gossweileri Qualitative and quantitative evaluation of bisindole usambarane alkaloids inStrychnos usambarensis roots by high performance liquid chromatography-diode-array