title: The colleflaccinosides, two chiral bianthraquinone glycosides with antitumor activity from the lichen Collema flaccidum collected in Israel and Russia.
abstract: Colleflaccinosides A and B, two chiral bianthraquinone glycosides from the two geographical varieties of lichen Collema flaccidum collected in Russia and Israel have been isolated as new natural products. Their structures were elucidated using UV, CD, IR, MS, 1D and 2D NMR spectral data, and chemical degradation. The colleflaccinosides B had significant antitumor activity in the crown gall tumor inhibition test.
authors.affiliation: Institute of Microbiology, Czech Academy of Sciences, Vídenská 1083, 142 20 Prague, Czech Republic. rezanka@biomed.cas.cz
authors.forename: Tomás
authors.initials: T
authors.lastname: Rezanka
authors.forename: Valery M
authors.initials: VM
authors.lastname: Dembitsky
mesh_terms: D016960:Agrobacterium tumefaciens / Q000187:drug effects; D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002942:Circular Dichroism; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D007557:Israel; D008011:Lichens / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D008968:Molecular Conformation; D019906:Nuclear Magnetic Resonance, Biomolecular; D010941:Plant Tumors; D012426:Russia; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000880:Anthraquinones; D000890:Anti-Infective Agents; D000972:Antineoplastic Agents, Phytogenic; D006027:Glycosides