Alkaloids from the cactus genus Gymnocalycium (Cactaceae)

Alkaloids from the cactus genus Gymnocalycium (Cactaceae) Alkaloids from the genus Gymnocalycium (Cactaceae)—II Alkaloids from Eucharis amazonica (Amaryllidaceae). Cactaceae Alkaloids XVIII: Two New Alkaloids from Coryphantha Calipensis H. Bravo Studies on alkaloids from Thalictrum species Alkaloids from Neobuxbaumia species (Cactaceae) Isoechinatine, a Pyrrolizidine Alkaloid from Cynoglossum furcatum Alkaloids of the corms of Colchicum laetum Cactus Alkaloids. XXXIX. A Glucotetrahydroiosquinoline From the Mexican Cactus, Pterocereus gaumeri Alkaloids of Hippeastrum glaucescens