Key indicators: single-crystal X-ray study; T = 273 K; mean (C-C) = 0.002 Å; R factor = 0.037; wR factor = 0.102; data-to-parameter ratio = 12.8.The molecule of the title compound, C 11 H 14 N 2 O 3 , adopts a trans configuration with respect to the C N bond. The dihedral angle between the benzene ring and the hydrazinecarboxylate plane is 12.06 (9) . Molecules are linked into a one-dimensional network by N-HÁ Á ÁO hydrogen bonds and C-HÁ Á Á interactions. The benzene rings of inversion-related molecules are stacked with their centroids separated by 3.777 (1) Å , indicating -interactions. Related literature

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The asymmetric unit of the title compound, C11H14N2O3, contains two independent mol­ecules with close conformations; the C=N—N—C torsion angle is 176.4 (1)° in both mol­ecules. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into chains running along the [01] direction.

A series of new dimethyl-3,6-di(aryl)-1,4-dihydro-1,2,4,5-tetrazine-1,4-dicarboxylates were synthesised through an intermolecular cyclisation reaction of methyl N′-(α-chloro-substituted benzylidene) hydrazinecarboxylate and triethylamine. Their 1,4-dihydro-s-tetrazine structures were characterised by IR, 1 H NMR, MS, elemental analysis. Their antitumour activities were evaluated in vitro by the SRB method for A-549 cells and the MTT method for P-388 cells. The results show that none of the compounds had a high activity, but the substituents clearly had an effect on their antitumour activity.