{"refrec":{"BRefID":218502,"RR":"<b>Schneemann, I.; Ohlendorf, B.; Zinecker, H.; Nagel, K.; Wiese, J.; Imhoff, J.F.</b> (2010). Nocapyrones A-D, gamma-pyrones from a <i>Nocardiopsis</i> strain isolated from the marine sponge <i>Halichondria panicea</i>. <i>J. Nat. Prod. 73(8)</i>: 1444-1447. <a href=\"http://dx.doi.org/10.1021/np100312f\" target=\"_blank\">http://dx.doi.org/10.1021/np100312f</a>","BEntID":210245,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Nat. Prod. 73(8)</i>: 1444-1447. <a href=\"http://dx.doi.org/10.1021/np100312f\" target=\"_blank\">http://dx.doi.org/10.1021/np100312f</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Schneemann, I.; Ohlendorf, B.; Zinecker, H.; Nagel, K.; Wiese, J.; Imhoff, J.F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Schneemann, I. <i>et al.</i>","Englishabstract":"Four new ?-pyrones, nocapyrones A-D (1-4), were isolated from an organic extract of the Nocardiopsis strain HB383, which was isolated from the marine sponge Halichondria panicea. These are the first ?-pyrones reported from a Nocardiopsis strain. The structures were elucidated on the basis of one- and two-dimensional NMR experiments and supported by HPLC-UV/MS and HRESIMS analyses. The biosynthesis of nocapyrone A was investigated by feeding experiments with 13C-labeled compounds. 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