From the root bark of the Apocynaceae Gabunia eglandulosa STAPE seven indole alkaloids were isolated. Besides the known indole alkaloids (−)‐isovoacangine (1), (−)‐coronaridine (2), voacamine (3), vobasine (4), and perivine (5), two new bases (−)‐19‐hydroxy‐isovoacangine (6) and 19‐hydroxy‐coronaridine (15) were isolated. Compound 6 was obtained by oxidation of isovoacangine with iodine. Similar oxidation reactions with voacangine (12) were studied. Copyright © 1975 Verlag GmbH & Co. KGaA, Weinheim