title: New antitumor bicyclic hexapeptides, RA-XI, -XII, -XIII and -XIV from Rubia cordifolia.
abstract: Four new bicyclic hexapeptides, named as RA-XI, -XII, XIII and -XIV were isolated from Rubia cordifolia and showed potent antitumor activities against P-388. The structures were elucidated from spectroscopic and chemical evidences. RA-XII, XIII and -XIV were proved to be unique bicyclic hexapeptidic glucosides.
authors.affiliation: Department of Pharmacognosy, Tokyo College of Pharmacy, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Morita
authors.forename: T
authors.initials: T
authors.lastname: Yamamiya
authors.forename: K
authors.initials: K
authors.lastname: Takeya
authors.forename: H
authors.initials: H
authors.lastname: Itokawa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000970:Antineoplastic Agents / Q000302:isolation & purification* / Q000494:pharmacology; D007941:Leukemia P388 / Q000188:drug therapy / Q000473:pathology; D051379:Mice; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000302:isolation & purification* / Q000494:pharmacology; D010456:Peptides, Cyclic / Q000302:isolation & purification* / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D009842:Oligopeptides; D010456:Peptides, Cyclic