title: Nakijiquinones J--R, sesquiterpenoid quinones with an amine residue from okinawan marine sponges.
abstract: Nine new sesquiterpenoid quinones, nakijiquinones J-R (1-9), have been isolated from three collections of Okinawan marine sponges of the family Spongiidae, and the structures and configurations were elucidated from the spectroscopic data and chemical correlations. Nakijiquinones J-L (1-3), M and N (4 and 5, respectively), O (6), P and Q (7 and 8, respectively), and R (9) are new sesquiterpenoid quinones possessing (S)-2-methylbutylamine, isopentylamine, isobutylamine, phenethylamine, and taurine residues, respectively, attached to each quinone ring.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Ushio
authors.forename: Takaaki
authors.initials: T
authors.lastname: Kubota
authors.forename: Sunao
authors.initials: S
authors.lastname: Yamamoto
authors.forename: Jane
authors.initials: J
authors.lastname: Fromont
authors.forename: Jun'ichi
authors.initials: J
authors.lastname: Kobayashi
mesh_terms: D000818:Animals; D008386:Marine Biology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D011161:Porifera / Q000737:chemistry*; D011809:Quinones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D011809:Quinones; D018719:Erb-b2 Receptor Tyrosine Kinases; D012717:Sesquiterpenes