738932.fig.003
Figure 3: Mass Mass spectrum of 2-{2-amino-2-(cyclohexane-1,4-diene)-acetylamino]-carboxy-methyl}-5-methyl-1-oxo-1,2,3,6-tetrahydro-1λ-4-[1,3]thiazine-4-carboxylic acid with its parent molecular ion peak at mass/charge at 384.5 amu.