The peptide-like molecule cyanoformamide (NCCONH2) is the cyano (CN) derivative of formamide (NH2CHO). It is known to play a role in the synthesis of nucleic acid precursors under prebiotic conditions. In this paper, we present a tentative detection of NCCONH2 in the interstellar medium with the Atacama Large Millimeter/submillimeter Array (ALMA) archive data. 10 unblended lines of NCCONH2 were seen around 3σ noise levels toward Sagittarius B2(N1E), a position that is slightly offset from the continuum peak. The column density of NCCONH2 was estimated to be 2.4 × 1015 cm−2, and the fractional abundance of NCCONH2 toward Sgr B2(N1E) was 6.9 × 10−10. The abundance ratio between NCCONH2 and NH2CHO is estimated to be ∼0.01. We also searched for other peptide-like molecules toward Sgr B2(N1E). The abundances of NH2CHO, CH3NCO and CH3NHCHO toward Sgr B2(N1E) were about 1/10 of those toward Sgr B2(N1S), while the abundance of CH3CONH2 was only 1/20 of that toward Sgr B2(N1S).

中文翻译：

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太空中氰基甲酰胺 NCCONH2 的初步探测

肽样分子氰基甲酰胺 (NCCONH2) 是甲酰胺 (NH2CHO) 的氰基 (CN) 衍生物。已知它在益生元条件下的核酸前体合成中发挥作用。在本文中，我们利用阿塔卡马大型毫米/亚毫米阵列（ALMA）档案数据对星际介质中的 NCCONH2 进行了初步探测。在 3σ 噪声水平附近看到 10 条未混合的 NCCONH2 线朝向人马座 B2(N1E)，该位置稍微偏离连续峰。NCCONH2 的柱密度估计为 2.4 × 1015 cm−2，NCCONH2 对 Sgr B2(N1E) 的丰度分数为 6.9 × 10−10。NCCONH2 和 NH2CHO 之间的丰度比估计为 ∼0.01。我们还寻找了其他针对 Sgr B2(N1E) 的肽样分子。Sgr B2(N1E)的NH2CHO、CH3NCO和CH3NHCHO丰度约为Sgr B2(N1S)的1/10，而CH3CONH2的丰度仅为Sgr B2(N1S)的1/20。