Abstract
AbstractMass spectra of 3‐hydroxypteridin‐4‐one and five of its mono‐and di‐methyl derivatives are recorded. Fragmentation of the non‐methyl compound (I; R1 R2 R3 H) occurred mainly by successive losses of NO, CO, HCN and HCN. Changes in m/e values of the major peaks with methyl‐substitution pattern in the derivatives were consistent with the proposed fragmentation pattern. Several minor fragmentation pathways were also observed but all involved an initial loss from the oxygen containing ring.
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