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Crystal structure of the title compound viewed down the b axis. Hydrogen bonds N1–H1N···O1(i) and N2–H2N···O2(ii) give rise to infinite molecular chains running along the c axis. Symmetry codes: (i) x,-y,z + 1/2; (ii) x,-y + 1,z + 1/2. H atoms not involved in hydrogen bonding are omitted.
