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We report the first detection in the interstellar medium of the Z-isomer ofcyanomethanimine (HNCHCN), an HCN dimer proposed as precursor of adenine. Weidentified six transitions of Z-cyanomethanimine, along with five transitionsof E-cyanomethanimine, using IRAM 30m observations towards the Galactic Centerquiescent molecular cloud G+0.693. The Z-isomer has a column density of(2.0$\pm$0.6)$\times$10$^{14}$ cm$^{-2}$ and an abundance of1.5$\times$10$^{-9}$. The relative abundance ratio between the isomers is[Z/E]$\sim$6. This value cannot be explained by the two chemical formationroutes previously proposed (gas-phase and grain surface), which predictsabundances ratios between 0.9 and 1.5. The observed [Z/E] ratio is in goodagreement with thermodynamic equilibrium at the gas kinetic temperature(130$-$210 K). Since isomerization is not possible in the ISM, the two speciesmay be formed at high temperature. New chemical models, including surfacechemistry on dust grains and gas-phase reactions, should be explored to explainour findings. Whatever the formation mechanism, the high abundance of Z-HNCHCNshows that precursors of adenine are efficiently formed in the ISM.

Abundant Z-cyanomethanimine in the interstellar medium: paving the way to the synthesis of adenine