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???