title: 6-Methoxy-7-methyl-8-oxoguanine, an unusual purine from the ascidian Symplegma rubra.
abstract: A new purine derivative, 6-methoxy-7-methyl-8-oxoguanine (1), along with 8-oxoadenine (2) and the human metabolite 3-methylxanthine (3), has been isolated from the ascidian Symplegma rubra collected on the southeastern coastline of Brazil. The structures of the three purines were established by analysis of spectroscopic data.
authors.affiliation: Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, CEP 13560-970, São Carlos, SP, Brazil.
authors.forename: B S
authors.initials: BS
authors.lastname: Lindsay
authors.forename: A M
authors.initials: AM
authors.lastname: Almeida
authors.forename: C J
authors.initials: CJ
authors.lastname: Smith
authors.forename: R G
authors.initials: RG
authors.lastname: Berlinck
authors.forename: R M
authors.initials: RM
authors.lastname: da Rocha
authors.forename: C M
authors.initials: CM
authors.lastname: Ireland
mesh_terms: D000818:Animals; D001938:Brazil; D006147:Guanine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D013056:Spectrophotometry, Ultraviolet; D014561:Urochordata / Q000737:chemistry*
chemical_list: C402918:6-methoxy-7-methyl-8-oxoguanine; D006147:Guanine