title: Proisocrinins A-F, brominated anthraquinone pigments from the stalked crinoid Proisocrinus ruberrimus.
abstract: New brominated anthraquinone pigments, proisocrinins A-F (1-6), were isolated from the strikingly scarlet-colored stalked crinoid Proisocrinus ruberrimus, which had been collected in the deep sea of the Okinawa Trough, Japan. The structures of the compounds were elucidated by spectroscopic analysis including HRMS, 1D 1H and 13C NMR, and 2D NMR. CD spectroscopy revealed that all compounds are present as optically active enantiomers. This is the first report of tribromo and tetrabromo anthraquinones from a natural source.
authors: Institute of Analytical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria. klaus.wolkenstein@jku.at
authors: Klaus
authors: K
authors: Wolkenstein
authors: Wolfgang
authors: W
authors: Schoefberger
authors: Norbert
authors: N
authors: Müller
authors: Tatsuo
authors: T
authors: Oji
mesh_terms: D000818:Animals; D000880:Anthraquinones / Q000737:chemistry* / Q000302:isolation & purification*; D004447:Echinodermata / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000737:chemistry* / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D009792:Oceans and Seas; D013237:Stereoisomerism
chemical_list: D000880:Anthraquinones; D006842:Hydrocarbons, Brominated