title: Calyculatine: a new dolabellane diterpenoid from the marine sponge Eunicea calyculata.
abstract: A new dolabellane diterpenoid, 7(S)-hydroperoxy-13-keto-(1S,11R)-dolabella-3(E),8(17),12(18)-triene (1), and two known compounds, 7(S),8(S)epoxy-13-keto-1(S),11(R)-dolabella-3(E),12 (18)-diene (2) and 13-keto-1(S),11(R)-dolabella-3(E),7(E),12(18)-triene (3), were isolated from the marine sponge Eunicea calyculata. The structure of 1 was elucidated by 1D (1)H- and (13)C-NMR spectra and 2D HMQC, HMBC, and the relative stereochemistry was established by analysis of coupling constants and NOESY spectra. In addition, an X-ray crystallographic analysis on a single crystal of 2 was carried out. Compounds 1 and 2 were inactive in the hyphae formation inhibition assay (HFI) in Streptomyces 85E while compound 3 showed inhibitory activity at a concentration of 20 microg/20 microL in the HFI assay.
authors.affiliation: Department of Chemistry and Biochemistry, College of Science and Engineering, University of Minnesota Duluth, Duluth, MN, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Xiang
authors.forename: Leng Chee
authors.initials: LC
authors.lastname: Chang
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D008517:Phytotherapy; D011161:Porifera; D013302:Streptomyces / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents; D004224:Diterpenes; C514142:calyculatine