The new alkaloid ervincidine has been isolated from the epigeal part of Vinca erecta. The results of a study of the IR, UV, and mass spectra of the base and of its O,O′-diacetyl derivative have permitted the probable structure of 6-hydroxy-16-demethoxycarbonylpolyneuridine to be put forward for ervincidine. © 1974 Consultants Bureau.