title: Antitumor active pyrrolizidine alkaloids from Heliotropium marifolium RETZ.
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification; D010946:Plants, Medicinal; D011763:Pyrrolizidine Alkaloids / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D011763:Pyrrolizidine Alkaloids