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The molecular formula C4H4O2 may refer to: Cyclobutanediones 1,2-Cyclobutanedione 1,3-Cyclobutanedione Cycloprop-2-ene carboxylic acid Diketene Dioxins 1,2-Dioxin 1,4-Dioxin 2-Furanone Methyl propiolate Tetrolic acid
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).