从巴西的马钱属植物三脉马钱Strychnostrinervis(Vell.)Mart.根部得到了四种生物碱,其中的三种生物碱双去甲二氢毒马钱碱(bisnordihydrotoxiferine)(2)、降马枯素B(normacusine B)(3)及长尾马钱碱(longicaudatine)(4)为已知化合物。第四个化合物为新化合物,命名为三脉马钱碱(trinervine)(1)。作者按文献方法将采自巴西东北地区的三脉马钱根(1.5kg)进行提取,得到了总生物碱混合物(300g)。从非极性提取部分得到了(2)(330mg,0.02％),水层在0～5C下用NH_4OH调pH为9.5～10.0,然后用氯仿提 Four alkaloids were obtained from the roots of Strychnostrinervis (Vell.) Mart from the St. Basil plant in Brazil. Among them, three alkaloids, bisnordihydrotoxiferine (2), and horses Nomacusine B (3) and longicaudatine (4) are known compounds. The fourth compound is a new compound named trinervine (1). The author extracted the three-vessel root (1.5 kg) collected from the northeast region of Brazil according to a literature method to obtain a total alkaloid mixture (300 g). From the non-polar extract fraction, (2) (330 mg, 0.02%) was obtained. The water layer was adjusted to pH 9.5 to 10.0 with NH 4 OOH at 0 to 5C, and then extracted with chloroform.