Hi..

I have done the mass spectra (ESI+-MS) of n-acetyl neuraminic acid(309.27g/mol) we found following peak

 Molecular -ion 59, 272, 274,  292,  314,  332,333,  334, 641

   Intesities        827, 384, 1736, 557,3398, 12376, 2147, 650

Can someone anlyze which is molecular ion peak and which one base peak???

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