Axiphenylalaninium and axityrosinium, modified amino acids from the Mediterranean marine sponge Axinella polypoides.

@article{Gabant2009AxiphenylalaniniumAA,
  title={Axiphenylalaninium and axityrosinium, modified amino acids from the Mediterranean marine sponge Axinella polypoides.},
  author={Marion Gabant and Marie-Thérèse Martin and C{\'e}line Moriou and Ludmila Ermolenko and Vincent Gu{\'e}rineau and Pascal Retailleau and Odile Thoison and Nicole Boury‐Esnault and Thierry P{\'e}rez and Ali Al‐Mourabit},
  journal={Journal of natural products},
  year={2009},
  volume={72 10},
  pages={
          1875-8
        }
}
Two new modified amino acids, axiphenylalaninium (1) and axityrosinium (2), along with four known metabolites, C2-alpha-D-mannosylpyranosyl-L-tryptophan (3), N3,5'-cycloxanthosine (4), palythine (5), and taurine, were isolated from the marine sponge Axinella polypoides collected in the Mediterranean Sea. The structures were determined by spectroscopic studies and confirmed by X-ray analysis and chemical modifications. 

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