Mass spectra of 5H-pyrimido[4,5-b][1,4]thiazine-4,6(3H,7H)-dione and its mono- and poly-methyl derivatives are described. The fragmentation pathways were elucidated with the aid of deuterium labelling and accurate mass measurements. Spectra of some 5-allyl derivatives are also described.
J. Clark, M. R. Hughes and I. Southon, J. Chem. Soc., Perkin Trans. 2, 1974, 1277 DOI: 10.1039/P29740001277
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