Also known as methanediimine
thumb|right|General structure of trans-carbodiimides: The core functional group is shown in blue with attached Substituent|R groups
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thumb|right|General structure of trans-carbodiimides: The core functional group is shown in blue with attached Substituent|R groups
In organic chemistry, a carbodiimide (systematic IUPAC name: methanediimine) is a functional group with the formula RN=C=NR. On Earth they are exclusively synthetic, but in interstellar space the parent compound HN=C=NH has been detected by its maser emissions.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).