1-[3-(4-Chlorophenyl)-6-methyl-1,6-dihydro-1,2,4,5-tetrazin-1-yl]ethanone

In the title compound, C11H11ClN4O, the tetrazine ring adopts a non-symmetrical boat conformation. The crystal packing exhibits relatively short intermolecular C...N contacts of 3.118 (3) .