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Incorporation into endogenous metabolic pathways of small fragments derived from I.C.I, 58,834(vioxazine).

1. Metabolic degradation of the tetrahydro-oxazine ring of 2-(2-ethoxyphenoxymethyl)-2,3,5,6-tetrahydro-1,4-oxazine (I.C.I. 58,834) gives rise to one- or two-carbon fragments which are utilized by endogenous metabolic pathways. 2. Evidence of this in dogs is shown by the 14C-labelled residues in tissues, 14C-labelled material in blood which has a half-life of three weeks, and elimination of [14C]urea in urine. 3. The same phenomenon occurs in rat, mouse and man, but to a smaller extent than in the dog. 4. Intravenous administration of [14C]ethanolamine to a dog gave rise to residual 14C blood levels with a half-life comparable to that produced by metabolic incorporation of 14C from 14C-I.C.I. 58,834.