Abstract
The 1,2,4-triazine ring of the title compound, C8H13N3O3, is nearly planar (r.m.s. deviation = 0.019 angstrom). The imino group is hydrogen-bond donor to the exocyclic O atom at the 5-position of an adjacent molecule, the N-H center dot center dot center dot O hydrogen bond generating a chain parallel to the b axis.