10-Hydroxy-Nb-methyl-corynantheol, a new quaternary alkaloid from the stem bark of Strychnos usambarensis

10-Hydroxy-Nb-methyl-corynantheol, a new quaternary alkaloid from the stem bark of Strychnos usambarensis 17-O-Acetyl,10-hydroxycorynantheol, a Selective Antiplasmodial Alkaloid Isolated fromStrychnos usambarensisLeaves 3′,4′,5′,6′ Tetradehydrolongicaudatine Y, an anhydronium base from Strychnos usambarensis 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> CONTRIBUTION A L'ETUDE DES ALCALOIDES DU<i>STRYCHNOS USAMBARENSIS</i>¹ Qualitative and quantitative evaluation of bisindole usambarane alkaloids inStrychnos usambarensis roots by high performance liquid chromatography-diode-array Quaternary indole alkaloids from the stem bark of Strychnos guianensis 12'-Hydroxystrychnobiline, Nouvel Alcaloïde Bisindolinique du Strychnos variabilis A New Strychnobrasiline Base of Strychnos Mattogrossensis