| 1 | 33239-40-6 | 4-氨基-2,4-二氧代丁酸 | 2-oxosuccinamic acid | C4H5NO4
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| 2 | 57528-68-4 | S-2,3-二羧基吖丙啶 | 2,3-dicarboxyaziridine | C4H5NO4
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| 3 | 79067-61-1 | 2-iminobutanedioic acid | 2-iminobutanedioic acid | C4H5NO4
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| 4 | 33043-54-8 | L-Serine N-Carboxyanhydride | L-Serine N-Carboxyanhydride | C4H5NO4
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| 5 | 87005-16-1 | Butanal, 2-nitro-3-oxo- (9CI) | Butanal, 2-nitro-3-oxo- (9CI) | C4H5NO4
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| 6 | 6229-58-9 | Glycine, N-(carboxymethylene)- | Glycine, N-(carboxymethylene)- | C4H5NO4
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| 7 | 83841-00-3 | R-2-恶唑烷酮-4-羧酸 | R-2-Oxo-4-oxazolidinecarboxylic acid | C4H5NO4
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| 8 | 81130-97-4 | (S)-2-氧代恶唑烷-5-羧酸 | (S)-2-Oxooxazolidine-5-carboxylic acid | C4H5NO4
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| 9 | 60487-08-3 | 2-氧代-1,3-噁唑烷-5-羧酸 | 2-oxo-1,3-oxazolidine-5-carboxylic acid | C4H5NO4
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| 10 | 31108-37-9 | Crotonic acid, 3-hydroxy-2-nitroso- (8CI) | Crotonic acid, 3-hydroxy-2-nitroso- (8CI) | C4H5NO4
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| 11 | 144365-55-9 | 2,4-Oxazolidinedione,3-(hydroxymethyl)-(9CI) | 2,4-Oxazolidinedione,3-(hydroxymethyl)-(9CI) | C4H5NO4
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| 12 | 45649-05-6 | 2,5-Oxazolidinedione,4-hydroxy-4-methyl-(9CI) | 2,5-Oxazolidinedione,4-hydroxy-4-methyl-(9CI) | C4H5NO4
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| 13 | 89033-26-1 | Cyclopropanecarboxylic acid, 2-nitro- (6CI,7CI) | Cyclopropanecarboxylic acid, 2-nitro- (6CI,7CI) | C4H5NO4
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| 14 | 22882-44-6 | Cyclopropanecarboxylic acid, 2-nitro-, cis- (8CI) | Cyclopropanecarboxylic acid, 2-nitro-, cis- (8CI) | C4H5NO4
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| 15 | 783255-70-9 | Oxiranecarboxylic acid, 3-(aminocarbonyl)- (9CI) | Oxiranecarboxylic acid, 3-(aminocarbonyl)- (9CI) | C4H5NO4
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| 16 | 89033-27-2 | 2-氧代-1,3-噁唑烷-4-羧酸 | 2-oxo-1,3-oxazolidine-4-carboxylic acid(SALTDATA: FREE) | C4H5NO4
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| 17 | 22882-43-5 | Cyclopropanecarboxylic acid, 2-nitro-, (1R,2R)-rel- (9CI) | Cyclopropanecarboxylic acid, 2-nitro-, (1R,2R)-rel- (9CI) | C4H5NO4
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