STUDIES ON INDOLE-ALKALOIDS: PART I. PHYTOCHEMICAL INVESTIGATION OF CATHARANTHUS LANCEUS (APOCYNACEAE). PART II. CHEMOTAXONOMICAL STUDY OF VINCA LIBANOTICA (APOCYNACEAE). AYNILIANGEORGE HAGOP. 2014 STUDIES ON INDOLE-ALKALOIDS: PART I. PHYTOCHEMICAL INVESTIGATION OF CATHARANTHUS LANCEUS (APOCYNACEAE). PART II. CHEMOTAXONOMICAL STUDY OF VINCA LIBANOTICA (APOCYNACEAE).