title: Polyaxibetaine, an amino acid derivative from the marine sponge Axinella polypoides.
abstract: A new pyridinium derivative, polyaxibetaine (3), has been isolated from the marine sponge Axinella polypoides, together with two known modified amino acids, 1 and 2. The planar structure of compound 3 has been elucidated by spectroscopic methods; definition of the absolute configuration of compounds 1-3 has been carried out through ECD studies.
authors.affiliation: Dipartimento di Chimica delle Sostanze Naturali, Università degli Studi di Napoli Federico II, Via D. Montesano 49, 80131, Napoli, Italy.
authors.forename: Anna
authors.initials: A
authors.lastname: Aiello
authors.forename: Ernesto
authors.initials: E
authors.lastname: Fattorusso
authors.forename: Paolo
authors.initials: P
authors.lastname: Luciano
authors.forename: Marialuisa
authors.initials: M
authors.lastname: Menna
authors.forename: Rocco
authors.initials: R
authors.lastname: Vitalone
mesh_terms: D000596:Amino Acids / Q000737:chemistry / Q000302:isolation & purification; D000818:Animals; D047089:Axinella / Q000737:chemistry*; D008386:Marine Biology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D011726:Pyridinium Compounds / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D000596:Amino Acids; D011726:Pyridinium Compounds; C545047:axiphenylalaninium; C545048:axityrosinium; C549606:polyaxibetaine