GILBERT, B Alkaloid studies. XXIII. Isolation of four new Aspidosperma cylindrocarpin, refractine, pyrifoline, and pyrifolidine alkaloids. [electronic resource] - Experientia Feb 1960 - 61-2 p. digital Publication Type: Journal Article ISSN: 0014-4754 Standard No.: 10.1007/BF02170260 doi Subjects--Topical Terms: Alkaloids--chemistryAspidospermaHumans